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: B \nExplanation: Shoer, more practical regimens staing later in pregnancy have been shown to reduce peripaum transmission by 40-50%. Ref: Aicle: Prevention of Mother-to-Child Transmission of HIV: Challenges for The Current Decade, 2001, Marie-Louise Newell1 ; Textbook of Obstetrics By Dutta, 6th Edition, Pages 300-302 ; Williams Obstetrics, 21st Edition, Page 1502 ; Harrison's Principles of Internal Medicine, 15th Edition, Pages 1858, 1901", 'role': 'assistant'}]