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 arm span 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 aoa, C. AR, D. MR', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (A.R.) A diastolic murmur in second right intercostals space in a patient of Marfan's syndrome suggests a diagnosis of Aoic Regurgitation.", 'role': 'assistant'}]