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
In measeles vaccine can be given within- 
Select and explain. 
A. 3 months, B. 5 months, C. 7 months, D. 6 months
D: 6 months
Answer: D: 6 months 
Explanation: The best age for measles vaccination is 9 months.
The 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.