This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, 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: Park's textbook of preventive and social medicine 23rd edition. *Terrestrial radiation: Radioactive elements such as thorium, uranium radium and an isotope of potassium are present in man's environment eg: soil, rocks, buildings. Areas exist eg: kerala in india where there are rock formations containing uranium.