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: Social & Preventive Medicine
[{'content': 'Risk of mother to child HIV transmission in pregnant woman at the time of delivery, and after delivery in non breast feeding woman is \nSelect and explain. \nA. 5-10%, B. 15-30%, C. 10-15%, D. More than 50%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HIV transmission in absence of intervention:\nMTCT of HIV in developed countries: 20% (15-25%)\nMTCT transmission of HIV in developing countries: 30% (25-35%)', 'role': 'assistant'}]