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': '2 weeks old baby having scrotal pigmentation along with hyponatremia, gypoglycemia and hyperkalemia enzyme deficient? \nSelect and explain. \nA. 11 beta hydroxylase, B. 21 a- hydroxylase, C. 3- Beta hydroxylase dehydrogenase, D. 17- hydroxylase deficiency', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 21 a- hydroxylase", 'role': 'assistant'}]