This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The most common cause of tricuspid regurgitation is secondary to \nSelect and explain. \nA. Rheumatoid hea disease, B. Dilation of right ventricle, C. Coronary aery disease, D. Endocarditis due to intravenous drug abuse', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 19 th ed pg 1548 In at least 80% of cases, TR is secondary to marked dilation of the tricuspid annulus from RV enlargement due to PA hypeension .Functional TR may complicate RV enlargement of any cause, however, including an inferior myocardial infarction (MI) that involves the RV.', 'role': 'assistant'}]