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: Gynaecology & Obstetrics
Which of the following results in the least veical transmission of HIV? 
Select and explain. 
A. Forceps delivery, B. Normal delivery, C. Breast feeding, D. Cesarean Section
D: Cesarean Section
Answer: D: Cesarean Section 
Explanation: Caesarean section before onset of labour and rupture of membranes approximately halves the risk of mother-to-child transmission. Timing Transmission rate During pregnancy 5-10% During labour and delivery 10-15% During breastfeeding 5-20% Overall without breastfeeding 15-25% Overall with breastfeeding to six months 20-35% Overall with breastfeeding to 18-24 months 30-45%