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: Surgery
The ideal timing of radiotherapy for WiIlm's tumor after surgery is - 
Select and explain. 
A. Within 10 days, B. Within 2 weeks, C. Within 2 months, D. Any time after surgery
A: Within 10 days
Answer: A: Within 10 days 
Explanation: Ans. is 'a' i.e. within 10 days The postoperative radiotherapy in Wilm's tumour is staed within 10 days of surgery. Delay in staing radiotherapy beyond ten days leads to tumor cells repopulation and increases the relapse rate.