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: Medicine
[{'content': 'Typhoral vaccine is recommended after - \nSelect and explain. \nA. 4 years, B. 6 years, C. At birth, D. After puberty', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]