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
Drugs causing afterload reduction is: 
Select and explain. 
A. Digoxin, B. Captopril, C. Dobutamine, D. Frusemide
B: Captopril
Answer: B: Captopril 
Explanation: None