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': 'The signs of malignant transformation in osteochondroma are all except \nSelect and explain. \nA. Pain, B. Weight loss, C. Increase in size, D. Increase in thickness of cailage cap', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Weight loss', 'role': 'assistant'}]