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
Anaerobic glycolysis of which of these produces 3 ATPs per unit glucose consumed? 
Select and explain. 
A. Amino acid, B. Fructose, C. Galactose, D. Glycogen
D: Glycogen
Answer: D: Glycogen 
Explanation: Answer- D. GlycogenAnaerobic glycolysis of glycogen produces 3 ATPs per unit glucose consumed.Consumption of ATP at the level of hexokinase is not required when we sta from glycogen as a substrate. As there is no glucose-6- phosphatase in muscle, glucose-6-phosphate directly enters into glycolysis. Hence, net ATPs are 4-1 = 3 ATPs.