This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Hypoxia causes vasoconstriction in 
Select and explain. 
A. Muscle, B. Lungs, C. Liver, D. Spleen
B: Lungs
Answer: B: Lungs 
Explanation: "O2 deficiency (Hypoxia), Accumulation of CO2,| PH produce vasoconstriction in the lungs. While these in the other tissues produce vasodilatation.Ref: Guyton; 13th edition