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 in soil', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Neonatal hypothyroidism', 'role': 'assistant'}]