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: Social & Preventive Medicine
[{'content': 'In measeles vaccine can be given within- \nSelect and explain. \nA. 3 months, B. 5 months, C. 7 months, D. 6 months', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The best age for measles vaccination is 9 months.\nThe age can be lowered to 6 months if there is measles outbreak in the community. For infants immunized between 6 months and 9 months of age, a second dose should be administered as soon as possible after the child reaches the age of 9 months provided that at least 4 weeks have elapsed since the last dose.', 'role': 'assistant'}]