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: Radiology
What is radioresistant – 
Select and explain. 
A. Cartilage, B. Seminoma, C. Ewings sarcoma, D. GI epithelium
A: Cartilage
Answer: A: Cartilage 
Explanation: Bone & cartilage are radioresistant.
Ewing's sarcoma, seminoma and GI epithelium are highly radiosensitive.