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: Pharmacology
Melphalan is used in - 
Select and explain. 
A. Multiple myeloma, B. Wilm's tumour, C. Neuroblastoma, D. Retinoblastoma
A: Multiple myeloma
Answer: A: Multiple myeloma 
Explanation: Ans. is 'a' i.e., Multiple myeloma o Melphalan is an anticancer (alkylating) agent which is most effective in multiple myeloma.