This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Minimal level of iodine at consumer level should be ________ppm - \nSelect and explain. \nA. 5, B. 10, C. 15, D. 30', 'role': 'user'}, {'content': "Answer: C \nExplanation: Level of iodine should be not less than 30ppm at the production point and is not less than 15ppm at consumer level.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-595", 'role': 'assistant'}]