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: Physiology
[{'content': 'The neurons may get irreversibly damaged if exposed to significant hypoxia for : \nSelect and explain. \nA. 8 min, B. 2 min, C. 30 sec, D. 15 sec', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 8 min', 'role': 'assistant'}]