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
The best indicator for monitoring the impact of Iodine Deficiency Disorders Control Programme is: 
Select and explain. 
A. Prevalence of goiter among school children, B. Urinary iodine levels among pregnant women, C. Neonatal hypothyroidism, D. Iodine level in soil
C: Neonatal hypothyroidism
Answer: C: Neonatal hypothyroidism 
Explanation: Neonatal hypothyroidism