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
Carcinoid syndrome produces valvular disease primarily involving 
Select and explain. 
A. Pulmonary valves, B. Tricuspid valves, C. Mitral valve, D. Aortic valve
B: Tricuspid valves
Answer: B: Tricuspid valves 
Explanation: None