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': 'Pseudohermaphroditism in a female child is most commonly due to – \nSelect and explain. \nA. 21–hydroxylase deficiency, B. 17–hydroxylase deficiency, C. 11–hydroxylase deficiency, D. 3–hydroxylase deficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Classic 21-hydroxylase deficiency is the most common cause of Ambiguous genitalia in a newborn.\nVirilization is usually apparent at birth in females i.e Pseudohermaphroditism of a female child.', 'role': 'assistant'}]