This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Metyrapone inhibits- \nSelect and explain. \nA. 11-B-hydroxylase, B. 21-B-hydroxylase, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: mineral I coical is specificially achieved by local metabolism of coisol to inactive compound coisone by 11B hyroxylase which is inhibited by metyrapone ( Harrison 17 pg 2248)', 'role': 'assistant'}]