Diseases and Health Risk Factors

While tobacco use is a major cause of cancer, diet is often cited as a significant factor in the development of many types of cancer, making it a primary focus for prevention.

Uncontrollable risk factors for heart disease include genetics, age, gender, and race. Stress is considered a controllable or modifiable risk factor because it can be managed through lifestyle changes.

Family history and genetics are uncontrollable risk factors for heart disease because they are inherited. Diabetes, high blood pressure, and high cholesterol are often considered manageable or controllable through lifestyle and medication.

Stress is a psychological response to external pressures or life events, such as exams, illness, or work demands. The other options are symptoms of stress, not causes.

Poverty is the root cause of malnutrition and undernutrition, as it limits an individual's access to sufficient, safe, and nutritious food.

Chronic malnutrition, or undernutrition, results from a lack of essential nutrients, leading to stunted growth, weakened immune systems, and cognitive impairment. Obesity is a result of overnutrition.

A stroke is medically referred to as a Cerebrovascular Accident (CVA), which occurs when blood flow to the brain is interrupted.

Hypertension is often caused by factors that narrow or harden arteries, such as atherosclerosis or arteriosclerosis, or by obesity. Anaemia is a condition characterized by a lack of red blood cells, which typically does not cause hypertension.

Skin cancer is highly prevalent, and statistics often cite that one in five Americans will develop some form of skin cancer in their lifetime due to UV exposure.

Non-communicable diseases (like heart disease or diabetes) are strongly linked to lifestyle factors. An unhealthy diet is a primary risk factor for these conditions.

Oncogenes are genes that has the potential to cause cancer.
Estrogens are a group of hormones that are important for female sexual and reproductive development.
Carcinogens are substances, radionuclide or radiation that is an agent directly involved in causing cancer.
Therefore, the correct answer is option D.

Carcinogen is a substance or agent that can cause cells to become cancerous by altering their genetic structure so that they multiply continuously and become malignant. Asbestos, DDT, and tobacco smoke are examples of carcinogens.

Cancer arises from the abnormal, purposeless, and uncontrolled division of cells that then invade and destroy the surrounding tissues.

Ulceration of the gastrointestinal mucosa is caused by disruption of the mucus layer on the gastric epithelial cells. It is wrong to believe that eating acidic foods may lead to development of peptic ulcers. Ulcer may be viewed as an extension of the cell damage found in acute gastritis. The most common sites for ulcers are the stomach and the first few centimetres of the duodenum. The main factors behind ulcer are:
(1) Reduced blood supply (Reduced blood flow and ischaemia may be caused by excessive cigarette smoking and stress, either physical or mental).
(2) Reduce mucus secretion (The composition and the amount of mucus may be altered, e.g., by regular and prolonged use of aspirin and other anti-inflammatory drugs by the reflux of bile acids and salts in chronic gastritis) and
(3) Raised levels of steroid hormones, e.g., in response to stress or when they are used as drugs in chronic gastritis by irradiation and the use of cytotoxic drugs).