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': 'The enzyme involved in the first committed step of glycolysis is: \nSelect and explain. \nA. Phosphofructokinase, B. Glucose-6-phosphatase, C. Hexokinase, D. Enolase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]