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': 'The best indicator for monitoring the impact of Iodine Deficiency Disorders control programme is : \nSelect and explain. \nA. Prevalence of goiter among school children, B. Urinary iodine levels among pregnant women, C. Neonatal Hypothyroidism, D. Iodine level is soil', 'role': 'user'}, {'content': "Answer: C \nExplanation: Neonatal hypothyroidism is a sensitive pointer to environmental iodine deficiency and thus can be an effective indicator for monitoring the impact of the programme. Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 426; Park's Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 467", 'role': 'assistant'}]