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: Medicine
Whis is the most common valvular abnormality in carcinoid hea disease ? 
Select and explain. 
A. Tricuspid insufficiency, B. Tricuspid stenosis, C. Pulmonary stenosis, D. Constrictive pericarditis
A: Tricuspid insufficiency
Answer: A: Tricuspid insufficiency 
Explanation: Overall, in patients with carcinoid hea disease, 97% have tricuspid insufficiency, 59% tricuspid stenosis, 50% pulmonary insufficiency, 25% pulmonary stenosis, and 11% left-side lesions. Reference: Harrisons Principles of Internal Medicine, 18th Edition