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
In treatment of osteosarcoma, all of the following are used EXCEPT : 
Select and explain. 
A. High dose methotrexate, B. Cyclophosphamide, C. Vincristine, D. Doxorubicin
C: Vincristine
Answer: C: Vincristine 
Explanation: None