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: Pediatrics
[{'content': 'Which of the following statements about 21 alpha-hydroxylase deficiency is false – \nSelect and explain. \nA. Most common cause of congenital adrenal hyperplasia in children, B. Affected females present with ambiguous genitalia, C. Affected males present with precocious puberty, D. Hypokalemic alkalosis is seen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In congenital adrenal hyperplasia due to 21 alpha-hydroxylase deficiency, there is hyperkalemia (not hypokalemia).', 'role': 'assistant'}]