This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Most common casue of acute RVF- 
Select and explain. 
A. Massive pulmonary embolism, B. Tricuspid stenosis, C. Pulmonary stenosis, D. Tricuspid regurgitation
A: Massive pulmonary embolism
Answer: A: Massive pulmonary embolism 
Explanation: pulmonary hypeension and massive pulmonary embolism are the most impoant cause of acute RVF Ref Davidson 23rd edition pg 478