This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anatomy
Hypoxic hypoxia is seen in 
Select and explain. 
A. CO poisoning, B. HCN poisoning, C. Ischemia, D. AV shunt
D: AV shunt
Answer: D: AV shunt 
Explanation: Type of hypoxia Features Examples Hypoxic hypoxia Occur when enough oxygen is not present in the air / when decreasing atmospheric pressure prevents diffusion of oxygen from lungs to blood stream High altitudes COPD AV shunt etc Anemic hypoxia Haemoglobin available to carry oxygen is reduced Anemia Non-functional Hb - Co poisoning; Met-Hb etc Stagnant hypoxia Decreased/ sluggish blood flow to tissues resulting in inadequate oxygen supply Ischemia/ congestion Histotoxic hypoxia Oxygen delivered to tissues is normal but tissues can't utilize oxygen. Cyanide poisoning