This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'Most common malignant tumor of heart in children is- \nSelect and explain. \nA. Rhabdomyoma, B. Rhabdomyosarcoma, C. Angiosarcoma, D. Lipoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' i.e. Rhabdomyosarcoma o Primary malignant cardiac tumors in children are almost exclusively sarcomas.o Located in the right side of the heart, atrial septum, right atrial wall, or root of the pulmonary artery.", 'role': 'assistant'}]