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: Pathology
[{'content': 'The Common "Primary" Tumor of Hea is: \nSelect and explain. \nA. Rhabdomyoma, B. Fibroma, C. Myxoma, D. Lipoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Myxoma', 'role': 'assistant'}]