This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 3, Subject name: Physiology
In which type of hypoxia does administration of O2 would have maximum benefit ? 
Select and explain. 
A. Stagnant hypoxia, B. Hypoxic hypoxia, C. Histotoxic hypoxia, D. Anemic hypoxia
B: Hypoxic hypoxia
Answer: B: Hypoxic hypoxia 
Explanation: Hypoxic hypoxia Low atmospheric Po2 leads to low aerial Po2. Hence,supplemental O2 can be helpful. Administration of oxygen-rich gas has limited value in anemic, histotoxic, and stagnant hypoxia because supplemental O2 can only increase the amount of dissolved O2 in the aerial blood as the O2-carrying capacity of the blood is otherwise normal in these conditions.