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': 'Which of the following anticoagulants used in estimating blood glucose prevents glycolysis \nSelect and explain. \nA. Oxalate, B. Citrate, C. NaF, D. Heparin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]