This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Most common tumour of hea is \nSelect and explain. \nA. Myxoma, B. Rhabdomyosarcoma, C. Fibroma, D. Leiomyosarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 1577: 289e-1 Myxomas are the most common type of primary cardiac tumor in adults, accounting for one-third to one-half of all cases at postmoem examination, and about three-quaers of the tumors treated surgically. They occur at all ages, most commonly in the third through sixth decades, with a female predilection. Approximately 90% of myxomas are sporadic; the remainder are familial with autosomal dominant transmission.', 'role': 'assistant'}]