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
The first product of "Glycogenolysis" is: 
Select and explain. 
A. Glucose- 6-phosphate, B. Glucose 1, 6 diphosphate, C. Glucose-1-phosphate, D. Fructose-l-phosphate
C: Glucose-1-phosphate
Answer: C: Glucose-1-phosphate 
Explanation: Glucose-1-phosphate