This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
[{'content': 'Drug not used for multiple myeloma is - \nSelect and explain. \nA. Boezonib, B. Lenalidomide, C. Methotrexate, D. Prednisone', 'role': 'user'}, {'content': "Answer: C \nExplanation: Drugs used in multiple myeloma include boezomib(proteasome inhibitor) & lenalidomide( a derivative of thalidomide ) as first line treatment .In older patients ,thalidomide combined with melphalan & prednisolone is used. Thalidomide has both anti-angiogenic effects against tumour blood vessels & immunomodulatory effects.Reference :Davidson's principles & practice of medicine 22nd edition pg no 1047.", 'role': 'assistant'}]