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': 'Antihypertensive drug of choice in a diabetic patient is: \nSelect and explain. \nA. Methyldopa, B. Beta blocker, C. ACE inhibitor, D. Thiazides', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]