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
When muscle glycogen is used for anarrobic glycolysis, how many ATPs are formed 
Select and explain. 
A. 2, B. 3, C. 4, D. 7
B: 3
Answer: B: 3 
Explanation: Normally anarrobic glycolysis produces 2 ATPs - But the end product of muscle glycogendysis is glucose - 6 - phosphate. Glucose - 6 - phosphatase) is absent in muscle. So the step catalysed by hexokinase / Glucokinase is not needed. Hence the answer is 3.