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': 'A drug not effective in Multiple Myeloma is? \nSelect and explain. \nA. Boezomib, B. Hydroxyurea, C. Melphalan, D. Cylcophosphamide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hydroxyurea REF: Harrison 17th ed chapter 106 Drugs used in chemotherapy of multiple myeloma are: Melphan Thalidomide Lenalidomide Cyclophosphamide Vincristine Doxorubicin (Adriamycin) and liposomal doxorubici', 'role': 'assistant'}]