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
Iodine comes in iodine salt. Req uirm en t at production and consumer level respectively - 
Select and explain. 
A. 20 & 10 PPNI, B. 30 & 10 PPM, C. 30& 15 PPM, D. 30 & 20 PPM
C: 30& 15 PPM
Answer: C: 30& 15 PPM 
Explanation: Ans. is "c' i.e., 30 & 15 PPM