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
[{'content': 'Iodine comes in iodine salt. Req uirm en t at production and consumer level respectively - \nSelect and explain. \nA. 20 & 10 PPNI, B. 30 & 10 PPM, C. 30& 15 PPM, D. 30 & 20 PPM', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is "c\' i.e., 30 & 15 PPM', 'role': 'assistant'}]