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
[{'content': 'The sho retroviral regime administration in the peripaum period decreases the risk of veical transmission by : \nSelect and explain. \nA. 30%, B. 50%, C. 65%, D. 75%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 65%', 'role': 'assistant'}]