This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': "Most common malignant bone tumor is: \nSelect and explain. \nA. Ewing's sarcoma, B. Osteosarcoma, C. Metastasis, D. Chondrosarcoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (Metastasis) Ref: Maheswari, 3rd ed, p. 224Metastatic tumors are the most common malignant tumors of the bone followed by primary bone tumors.Most common sites from which mets arise are:Lungs--in malesBreast-- in femalesProstateThyroidFrequently asked questions regarding bone tumorsMost common malignancy of bone-SecondariesMost common primary malignant bone tumour-Multiple myelomaMost common primary malignant tumour of long bones-OsteosarcomaMost common true benign tumour of bone-Osteoid osteomaCommonest benign tumour of bone-OsteochondromaHormone dependent bone tumour-fibrous dysplasiaMost common symptom of secondaries-pain', 'role': 'assistant'}]