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
Allosteric stimulator of glycogen synthase - 
Select and explain. 
A. AMP, B. Insulin, C. Glucose-6-phosphate, D. Glucose
C: Glucose-6-phosphate
Answer: C: Glucose-6-phosphate 
Explanation: Ans. is 'c' i.e., Glucose-6-phosphate [Ref Harper 29th/e p. 182 & 28th/e p.