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': 'Which among the following is the least common cause of infective endocarditis? \nSelect and explain. \nA. ASD, B. MS, C. VSD, D. AR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Among the following, ASD is the least common cause of infective endocarditis. Here the low turbulence is responsible for decreased incidence of IE.', 'role': 'assistant'}]