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: Pathology
[{'content': 'Most Common Valve Not involved in Rheumatic Fever: \nSelect and explain. \nA. Mitral, B. Aoic, C. Pulmonary, D. Tricuspid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tricuspid', 'role': 'assistant'}]