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': 'Stagnant hypoxia is seen in ? \nSelect and explain. \nA. COPD, B. Anemia, C. CO poisoning, D. Shock', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Shock", 'role': 'assistant'}]