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: Pediatrics
[{'content': 'Apnea of prematurity of lasts for ? \nSelect and explain. \nA. 10 sec, B. 15 sec, C. 20 sec, D. 30 sec', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]