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
Role of nitrates in congestive cardiac failure is due to? 
Select and explain. 
A. Direct inotropic action, B. Decrease preload, C. Decrease afterload, D. Coronary vasodilatation
B: Decrease preload
Answer: B: Decrease preload 
Explanation: Ans. is 'b' i.e., Decrease preload