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
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 ? 
Select and explain. 
A. Captopril, B. Guanethidine, C. Minoxidil, D. Metoprolol
C: Minoxidil
Answer: C: Minoxidil 
Explanation: None