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': 'ACE inhibitors are contraindicated in all of the following except: \nSelect and explain. \nA. Pregnancy, B. Diabetes, C. Bilateral renal artery stenosis, D. Renal failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]