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': 'Sodium fluoride is added to blood, as it inhibits: \nSelect and explain. \nA. Hexokinase, B. Glucokinase, C. Glucose-6-phosphatase, D. Enolase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sodium fluoride is used to conserve tissue samples in biochemistry and medicinal testing as fluoride ions stop glycolysis by inhibiting the enzyme enolase.Sodium fluoride is often used together with iodoacetic acid, which inhibits the enzyme aldolase', 'role': 'assistant'}]