This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': "Which of the following enzyme acts by a 'Ping-Pong' mechanism? \nSelect and explain. \nA. Alanine amino transferase, B. Hexokinase, C. Lactate Dehydrogenase, D. Pyruvate Dehydrogenase", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ping pong displacement: One or more products are released before all the substrate binds the enzyme', 'role': 'assistant'}]