This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following is the least useful drug for the use in Congestive cardiac failure? 
Select and explain. 
A. Bucindolol, B. Pimobenden, C. Vesnarinone, D. Trimetazidine
D: Trimetazidine
Answer: D: Trimetazidine 
Explanation: Trimetazidine is a novel antianginal drug which acts by nonhemodynamic mechanisms.