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
Drug of choice for Right heart failure is 
Select and explain. 
A. Sacubitril, B. Digoxin, C. Milrinone, D. Nesiritide
C: Milrinone
Answer: C: Milrinone 
Explanation: Milrinone is a PDE-3 inhibitor which prevents metabolism of cAMP. Increased cAMP increases myocardial contraction and vasodilation, used in Right heart failure.