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: Biochemistry
Sites where HMP shunts can occur include 
Select and explain. 
A. Liver, B. Lactating mammary gland, C. Testes, D. All of these
D: All of these
Answer: D: All of these 
Explanation: HMP shunt occurs in the cytosol. It is highly active in liver, adipose tissue, adrenal cortex, lens, cornea, lactating (but not the nonlactating) mammary gland, gonads (testis, ovary) and erythrocytes. The activity of this pathway is minimal in muscle and brain, where almost all of the glucose is degraded by glycolysis.