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
[{'content': 'Sites where HMP shunts can occur include \nSelect and explain. \nA. Liver, B. Lactating mammary gland, C. Testes, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]