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
The most common cause of tricuspid regurgitation is secondary to - 
Select and explain. 
A. Rheumatoid hea disease, B. Dilatation of right ventricle, C. Coronary aery disease, D. Endocarditis due to intravenenous drug abuse
B: Dilatation of right ventricle
Answer: B: Dilatation of right ventricle 
Explanation: Tricuspid regurgitation Primary Rheumatic Endocarditis Myxomatous (TVP) Carcinoid Radiation Congenital (Ebstein's) Trauma Papillary muscle injury (post-MI) Secondary RV and tricuspid annular dilatation Multiple causes of RV enlargement(e.g., long-standing pulmonary HTN)Chronic RV apical pacing ( Harrison&;s principle of internal medicine,18th edition,pg no. 1930 )