This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
After taking MMR live vaccine, conception should not occur within ? 
Select and explain. 
A. 2 weeks, B. 4 weeks, C. 8 weeks, D. 10 weeks
B: 4 weeks
Answer: B: 4 weeks 
Explanation: Measles-mumps-rubella (MMR) vaccine and its component vaccines should not be administered to women known to be pregnant. Because a risk to be fetus from administration of these live virus vaccines cannot be excluded for theoretical reasons, women should be counseled to avoid becoming pregnant for 28 days after vaccination with MMR vaccine or its component vaccines or varicella vaccine. Ref: Park 24th edition