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': 'Malignant tumor of striated muscle is known as: \nSelect and explain. \nA. Leiomyosarcoma, B. Rhabdomyosarcoma, C. Rhabdomyoma, D. Leiomyoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]