This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
To assess thyroid profile of a newborn, which of the following is mandatory? 
Select and explain. 
A. T4 only, B. TSH only, C. Both TSH and T4, D. T3 only
C: Both TSH and T4
Answer: C: Both TSH and T4 
Explanation: Thyroid function is assessed by estimation of serum TSH and free or total T3 and T4 Ref : Ghai pediatrics eighth edition pg no 516