This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'A patient has been prescribed a drug A by a doctor for treating his hypeension. 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: (Ref: KDT 6/e p548) Vasodilators can lead to reflex increase in the sympathetic activity. Activation of b1 receptors in the hea can cause tachyacardia and release of renin. Latter can result in retention of salt and water.', 'role': 'assistant'}]