This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
High dose Methotrexate is used for treatment of 
Select and explain. 
A. Osteosarcoma, B. Rhabdomyosarcoma, C. Retinoblastoma, D. Ewings sarcoma
A: Osteosarcoma
Answer: A: Osteosarcoma 
Explanation: Refer Harrison 17th/612 Drugs needs for Osteosarcoma Doxorubicin Ifosfamide Cisplatin High dose Methotrexate with Leucovorin