This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
Aerial O2 content is reduced in one of the following 
Select and explain. 
A. Stagnant hypoxia, B. Anemic hypoxia, C. Histotoxic hypoxia, D. Ischemic hypoxia
B: Anemic hypoxia
Answer: B: Anemic hypoxia 
Explanation: the anemic type, in which the amount of functional hemoglobin is too small, and hence the capacity of the blood to carry oxygen is too low Ref: guyton and hall textbook of medical physiology 12 edition page number: 353,354,355