This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraindications, AEFIs, Subject name: Social & Preventive Medicine
Ideal recommended time for observation for AEFI following immunization:- 
Select and explain. 
A. 15 minutes, B. 30 minutes, C. 45 minutes, D. 1 hour
B: 30 minutes
Answer: B: 30 minutes 
Explanation: AEFI - Adverse event following immunization. Ideal recommended observation for AEFI is 30 minutes after immunization of child.