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': 'A patient has been prescribed a drug A by a doctor for treating his hypertension. This drug can cause tachycardia and marked fluid retention. Which of the following can be the drug A ? \nSelect and explain. \nA. Captopril, B. Guanethidine, C. Minoxidil, D. Metoprolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]