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 of the following vaccines has maximum efficacy after a single dose - \nSelect and explain. \nA. Tetanus toxoid, B. DPT, C. Measles, D. Typhoid', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Measles", 'role': 'assistant'}]