This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bones, 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: Ans. is 'b' i.e., Secondarieso Secondaries are most common malignant bone tumor,o Osteogenic sarcoma is the most common primary malignant bone tumor,o Osteoma is most common benign bone tumor.", 'role': 'assistant'}]