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. Venous valves, B. Tricuspid valve, C. Mitral valve, D. Aoic valve
B: Tricuspid valve
Answer: B: Tricuspid valve 
Explanation: Answer is B (Tricuspid valve) The most commonly involved valve in carcinoid syndrome is tricuspid valve.