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': 'Which is not given at the time of birth ? \nSelect and explain. \nA. OPV, B. BCC, C. Hepatitis B, D. HiB', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]