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: Surgery
[{'content': 'In young person most common cancer among following is: \nSelect and explain. \nA. Giant cell, B. Osteosarcoma, C. Chondrosarcoma, D. Ewing sarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. OsteosarcomaOsteosarcoma is the second most common tumour.These tumours occur b/w the ages of 15-25 years, constituting the commonest musculo-skeletal tumour at that age', 'role': 'assistant'}]