This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Anaerobic glycolysis occurs in all except 
Select and explain. 
A. RBCs, B. Lens, C. Brain, D. Testis
C: Brain
Answer: C: Brain 
Explanation: In the brain, the requirement is substantial, and even in prolonged fasting the brain can meet no more than about 20% of its energy needs from ketone bodies. Glycolysis, the major pathway for glucose metabolism, occurs in the cytosol of all cells. It can function either aerobically or anaerobically, depending on the availability of oxygen and the electron transpo chain.Erythrocytes, which lack mitochondria, are completely reliant on glucose as their metabolic fuel, and metabolize it by anaerobic glycolysis. However, to oxidize glucose beyond pyruvate (the end product of glycolysis) requires both oxygen and mitochondrial enzyme systemsRef: harper&;s biochemistry 30 edition, page no: 168