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
[{'content': 'Ideal recommended time for observation for AEFI following immunization:- \nSelect and explain. \nA. 15 minutes, B. 30 minutes, C. 45 minutes, D. 1 hour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: AEFI - Adverse event following immunization. Ideal recommended observation for AEFI is 30 minutes after immunization of child.', 'role': 'assistant'}]