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
[{'content': 'Most common hea valve involved in IV drug user is: \nSelect and explain. \nA. Mitral valve, B. Aoic valve, C. Pulmonary valve, D. Tricuspid valve', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is D (Tricuspid valve) Most common hea valve involved in IV drug layers is tricuspid valve. 'In almost 50% of patients who have endocarditis associated with injection drug use, infection is limited to the tricuspid valve' - Harrisons Endocarditis in drug abusers: most common age of patients affected - young malese most often source of infecting microorganisms is: skine most common agent is staphylococcus aureus most common valve involved is Tricuspid valve. tricuspid valve (50%) > aoic valve (25%) > mitral valve (20%) > multiple valves (rest) murmurs are frequently absent9 Cardiac murmurs are almost always present in infective endocarditis except in patients with: - early acute endocarditis intravenous drug abuse with tricuspid valve infection", 'role': 'assistant'}]