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 vaccines are not given in a 8 years old unimmunized child – \nSelect and explain. \nA. Pertusis, B. Salk vaccine, C. BCG, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]