This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
A 55yr old women diagnosed to be Ca cervix stage 2B advised for chemo radiation Which of the following is true statement 
Select and explain. 
A. small bowel is most radio resistant, B. small blood vessels are most radio resistant, C. rapidly proliferating cells are most radio resistant, D. dose intensity of radiation is inversely propoional to the square of distance of the source
D: dose intensity of radiation is inversely propoional to the square of distance of the source
Answer: D: dose intensity of radiation is inversely propoional to the square of distance of the source 
Explanation: REF : SHAW GYNECOLOGY