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: Pediatrics
[{'content': 'The transmission of AIDS transplacentally is – \nSelect and explain. \nA. 10–20 %, B. 20–30 %, C. 30–40%, D. 40–50 %', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]