This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Radiology
Which of the following is true statement regarding radiation? 
Select and explain. 
A. Rapidly dividing cells are resistant to Radiation, B. GI mucosa is one of the most radioresistant tissue in the body, C. The intensity of Radiation is inversely propoional to the square of distance from the source, D. Small blood vessels are least resistant to radiation
C: The intensity of Radiation is inversely propoional to the square of distance from the source
Answer: C: The intensity of Radiation is inversely propoional to the square of distance from the source 
Explanation: According to Inverse square law in radiation, the intensity of radiation is inversely propoional to the square of distance from the source. Rapidly dividing cells , which are less differentiated are actually more radiosensitive Amongst the body cells, the most sensitive are spermatogonia and the least sensitive are nerve cells and muscle fibres