Question

which of the following is a genetic disorder?
a atelectasis
b cystic fibrosis
c emphysema
d anoxia

Explanation:

• Option A: Atelectasis is a collapse of lung tissue, often due to external factors like blockage or pressure, not genetic.
• Option B: Cystic fibrosis is a well - known genetic disorder caused by mutations in the CFTR gene, affecting the lungs, digestive system, etc.
• Option C: Emphysema is mainly caused by long - term smoking or exposure to harmful substances, not genetic in the typical sense of a hereditary disorder.
• Option D: (Assuming it's a typo, likely "anemia" which has various causes like nutritional deficiencies, blood loss, etc., and most types are not genetic disorders (though some rare forms are, but compared to cystic fibrosis, it's not the main genetic disorder here)).

Answer:

B. cystic fibrosis