This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
[{'content': 'Apnea in infant is cessation of breathing for: \nSelect and explain. \nA. >10 sec, B. >20 sec, C. >30 sec, D. >40 sec', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. >20sec(Ref: Nelson's 20/e p 849-850, Ghai 8/e p 171)In infants, apnea is defined as cessation of breathing for >20sec, or any duration if accompanied by cyanosis or bradycardia.", 'role': 'assistant'}]