Which of the following is not a hereditary disease?
Cystic fibrosis
Thalassemia
Haemophilia
Cretinism
Correct answer: Cretinism
Solution
Cystic fibrosis, thalassemia, and haemophilia are all inherited genetic disorders. Cretinism is usually due to congenital hypothyroidism or iodine deficiency, so it is not a hereditary disease.