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
All are used for carcinoma head & neck except- 
Select and explain. 
A. 5FU, B. Busulfan, C. Cisplatin, D. Methotrexate
B: Busulfan
Answer: B: Busulfan 
Explanation: Ans. is 'b' i.e., Busulfan o Impoant anticancer drugs used in head and neck cancers are Methotrexate 5-FU Bleomycin Cisplatin Docetaxel Cetuximab