This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'True about congenital adrenal hyperplasia is all except \nSelect and explain. \nA. Autosomal recessive disorder., B. 11 - β Hydroxylase deficiency is most common., C. Commonest cause of genital ambiguity at birth., D. Hypoglycemia is seen.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 21 - Hydroxylase deficiency is most common.', 'role': 'assistant'}]