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': 'A young basketball player with ht 188 cm and armspan 197 cm has a diastolic murmur best heard in second right intercostal space : likely cause of murmur is - \nSelect and explain. \nA. AS, B. Coarctation of aorta, C. AR, D. MR', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]