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
Glucokinase is inhibited by: 
Select and explain. 
A. ATP, B. ADP, C. Glucose 6 phosphate, D. All of the above
C: Glucose 6 phosphate
Answer: C: Glucose 6 phosphate 
Explanation: Hexokinase is inhibited allosterically by its product, glucose 6-phosphate. Ref: Harper 28th edition, chapter 17.