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: Medicine
[{'content': 'Resistant hypertension when goal is not achieved - \nSelect and explain. \nA. 4 drugs + diuretics, B. 2 drugs + diuretics, C. 3 drugs + diuretics, D. 5 drugs + diuretics', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]