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
Which of the following is most radioresistant? 
Select and explain. 
A. Cailage, B. GIT epithelium, C. Gonadal tumours, D. Ewing's sarcoma
A: Cailage
Answer: A: Cailage 
Explanation: Ans. Cailage