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: Medicine
[{'content': 'Multiple myeloma is treated by all, EXCEPT: \nSelect and explain. \nA. Lenalidomide, B. Boezomib, C. Thalidomide, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Relapsed myeloma can be treated with novel agents including lenalidomide and/or boezomib. Thalidomide, if not used as initial therapy, can achieve responses in refractory cases. High-dose melphalan and stem cell transplant, if not used earlier, also have activity in patients with refractory disease. Ref: Harrison's principle of internal medicine 17th edition, chapter 106.", 'role': 'assistant'}]