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
When does switchover from fetal to adult haemoglobin synthesis begins 
Select and explain. 
A. 14 weeks gestation, B. 30 weeks gestation, C. 36 weeks gestation, D. 7-10 days postnatal
C: 36 weeks gestation
Answer: C: 36 weeks gestation 
Explanation: 36 weeks of gestation is the period where conversion of fetal hemoglobin to adult hemoglobin occurs. Reference: GHAI Essential pediatrics, 8th edition