NICE guidelines for caesarean section state that antibiotics should be given before skin incision:
1.4.6.19
Offer women prophylactic antibiotics at CS before skin incision. Inform them that this reduces the risk of maternal infection more than prophylactic antibiotics given after skin incision, and that no effect on the baby has been demonstrated. [new 2011]
Therefore think the below MCQ is wrong:
Antibiotic prophylaxis should be given before the baby is delivered