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
Drug of choice for choriocarcinoma is? 
Select and explain. 
A. Nitrosourea, B. Gemcitabine, C. Methotrexate, D. Melphalan
C: Methotrexate
Answer: C: Methotrexate 
Explanation: Ans. is 'c' i.e., Methotrexate