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': 'Among which hypoxia AV 0 difference is max ? \nSelect and explain. \nA. Histotoxic, B. Stagnant, C. Hypoxic, D. Anemic', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Stagnant", 'role': 'assistant'}]