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
[{'content': 'Insulin acts on which enzyme is glycolysis : \nSelect and explain. \nA. Glucokinase, B. Hexokinase, C. Glucose-6-phosphatase, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]