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: Social & Preventive Medicine
Terrestrial radiation is maximum in- 
Select and explain. 
A. Karnataka, B. Orissa, C. West Bengal, D. Kerala
D: Kerala
Answer: D: Kerala 
Explanation: Ans. is 'd' i.e., Kerala Terrestrial radiation Radioactive elements such as thorium, Uranium, radium and an isotop of potassium (K40) arc present in man's invironment, e.g., soil, rocks, boiling. o It is estimated that man derives about 50 mrad per year from terrestrial radiation. Area exists (Kerala in India) where the rock formation containing uranium, it can be as high as 2000, mrad a year.