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
Chemotherapy is not useful in : 
Select and explain. 
A. Chondrosarcoma, B. Wilm's tumor, C. Choriocarcinoma, D. All
A: Chondrosarcoma
Answer: A: Chondrosarcoma 
Explanation: None