This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': 'Blood specimen for Neonatal thyroid screening is obtained on \nSelect and explain. \nA. Cord blood, B. 24 hours after bih, C. 48 hours after bih, D. 72 hours after bih', 'role': 'user'}, {'content': 'Answer: D \nExplanation: GUIDELINES FOR NEONATAL THYROID SCREENING - AMERICAN ACADEMY OF PEDIATRICS When to screen: Normal hospital delivery at term - Filter paper collection ideally at 2-4 days of age or at time of discharge NICU / preterm home bih - Within 7 days of bih Maternal history of thyroid medication / family history of congenital hypothyroidism - cord blood for screening Cord blood is to be used only if there is family history of hypothyroidism. In normal delivery, blood is taken at 2-4 days of age. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]