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': 'Substrate level phosphorylation is by \nSelect and explain. \nA. a) Pyruvate kinase, B. b) Phosphofructokinase, C. c) Hexokinase, D. d) ATP synthase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: substrate level phosphorylation-- Enzyme phosphoglycerate kinase- Enzyme pyruvate kinase.', 'role': 'assistant'}]