This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
[{'content': 'Enzyme activated by decrease in insulin glucagon ratio \nSelect and explain. \nA. Glucokinase, B. Hexokinase, C. PFK, D. glucose 6 phosphatase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ref : lipincott', 'role': 'assistant'}]