Multiple choice

Infectious disease are caused by an organism such as a virus or bacterium, which is called a

  1. pathogen

  2. toxicant

  3. pandemic

  4. carcinogen
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A Correct answer
Explanation

A pathogen is any biological agent, such as a virus, bacterium, or fungus, that causes disease in its host. Toxicants are generally chemical substances, whereas pandemics refer to the widespread occurrence of a disease.

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