This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Applied Aspects and Respiratory Adjustments, Subject name: Physiology
[{'content': 'In which O2 therapy is used - \nSelect and explain. \nA. Hypoxic hypoxia, B. Anemic hypoxia, C. Histotoxic, D. Stagnant', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hypoxic hypoxia", 'role': 'assistant'}]