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: Pharmacology
[{'content': 'Metyrapone acts by - \nSelect and explain. \nA. Inhibition of 17a-Hydroxylase, B. Inhibition of 21b-Hydroxylase, C. Inhibition of 11b-Hydroxylase, D. Inhibition of 3b-Hydroxysteroid dehydrogenase', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Inhbition of 11b-Hydroxylase o Metyrapone inhibits 1113-Hydroxylase in adrenal coex and prevents synthesis of hydrocoisone.", 'role': 'assistant'}]