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: Pathology
[{'content': "Which of the following is most Likely to be fatal? \nSelect and explain. \nA. Osteochondroma, B. Giant cell tumour, C. Paget's disease, D. Multiple myeloma", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]