<prompt> The best indicator for monitoring the impact of Iodine Deficiency Disorders control programme is :Prevalence of goiter among school childrenUrinary iodine levels among pregnant womenNeonatal HypothyroidismIodine level is soil  <response>: 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: Parks Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 426; Parks Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 467 