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 main site of fluoride inhibition in the Embden¬Meyerhof pathway of acid: \nSelect and explain. \nA. ATPase, B. Enolase, C. Pyruvate kinase, D. Fructose -6 phosphatase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]