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': 'Drug (s) used in the treatment of multiple myeloma is/are -a) Bortezomibb) Melphalanc) Hydroxyoread) Ketoconazolee) Cyclophosphamide \nSelect and explain. \nA. abc, B. abe, C. cde, D. acd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]