This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Risk of HIV transmission is highest during \nSelect and explain. \nA. During Caesarian section, B. During antepaum period, C. During vaginal delivery, D. Breast feeding', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]