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
Radiation exposure permissible per year is? 
Select and explain. 
A. 2 rads, B. 5 rads, C. 10 rads, D. 20 rads
B: 5 rads
Answer: B: 5 rads 
Explanation: Ans. (b) 5 radsRef: Park 20th ed p 651