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
Anemic hypoxia is due to 
Select and explain. 
A. ↓PO2 in arterial blood, B. ↑PO2 in arterial blood, C. ↑PCO2 in arterial blood, D. ↓O2 content in arterial blood
D: ↓O2 content in arterial blood
Answer: D: ↓O2 content in arterial blood 
Explanation: Arterial PO2/ Dissolved oxygen is normal in anemic hypoxia, but the arterial oxygen content is low. This may be due to anemia, CO poisoning etc.