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: Medicine
Radio resistant tumours are - a) Melanoma  b) HD  c) Seminoma  d) Ewing's sarcoma  e) Chondro sarcoma 
Select and explain. 
A. ae, B. bc, C. ad, D. ab
A: ae
Answer: A: ae 
Explanation: None