This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Mother to child transmission of HIV - \nSelect and explain. \nA. 25%, B. 50%, C. 60%, D. 75%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HIV may pass from infected mother to foetus through placenta or to her infant during delivery. In absence of any intervention rate of this vary from 20-25%. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 364', 'role': 'assistant'}]