Multiple choice Which of the following is not a hereditary disease? Haemophilia Cretinism Cystic fibrosis Thalassaemia Reveal answer Fill a bubble to check yourself B Correct answer Explanation Cretinism is a condition of severely stunted physical and mental growth due to untreated congenital deficiency of thyroid hormones (congenital hypothyroidism) usually due to maternal hypothyroidism.