This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
[{'content': 'Most common malignant bone tumors \nSelect and explain. \nA. Osteogenic sarcoma, B. Secondaries, C. Osteoma, D. Enchondroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metastatic tumors are the most common form of skeletal malignancy. Refer Robbins page no 8/e 1236p', 'role': 'assistant'}]