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
Drug of choice in multple myeloma is - 
Select and explain. 
A. Mechlorethamine, B. Vincristine, C. Vinblastine, D. Melphalan
D: Melphalan
Answer: D: Melphalan 
Explanation: None