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': 'Most common malignant bone tumor- \nSelect and explain. \nA. Osteogenic sarcoma, B. Secondaries, C. Osteoma, D. Enchondroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Secondaries are most common malignant bone tumor.\nOsteogenic sarcoma is the most common primary malignant bone tumor.\nOsteoma is most common benign bone tumor.', 'role': 'assistant'}]