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': 'Key glycolytic enzymes are all except: \nSelect and explain. \nA. PFK, B. Hexokinase, C. Pyruvate kinase, D. Glucose 1,6-phosphatase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]