This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
[{'content': 'Most common primary tumor of hea? \nSelect and explain. \nA. Myxoma, B. Rhabdomyosarcoma, C. Fibroma, D. Leiomyosarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary cardiac tumors are uncommon moreover, most also are benign. The descending order of frequency , these are myxomas, fibromas, lipomas, papillary fibroelastomas,rhabdomyomas Myxomas are the most common primary tumor of the adult hea. Robbins 9 th edition page no. 404', 'role': 'assistant'}]