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 following is an enzyme required for glycolysis: \nSelect and explain. \nA. Pyruvate kinase, B. Pyruvate carboxylase, C. Glucose-6-phosphatase, D. Glycerokinase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phosphoenol pyruvate (PEP) is dephosphorylated to pyruvate, by pyruvate kinase. First PEP is made into a transient intermediary of enol pyruvate; which is spontaneously isomerized into keto pyruvate, the stable form of pyruvate.\nReference: Vasudevan 7th\xa0 ed, pg 108', 'role': 'assistant'}]