This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
Average time interval between radiation exposure and genesis of post radiation Osteosarcoma 
Select and explain. 
A. 2 yrs, B. 4 yrs, C. 8 yrs, D. 16 yrs
D: 16 yrs
Answer: D: 16 yrs 
Explanation: Post radiation OGS usually arises after 12-16years Refer post radiation Osteosarcoma