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: Pathology
[{'content': 'Which of the following caspases is an initiator caspase? \nSelect and explain. \nA. Caspase 3, B. Caspase 6, C. Caspase 9, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The caspase family, now including more than 10 members, can be divided functionally into two groups--initiator and executioner--depending on the order in which they are activated during apoptosis. Initiator caspases include caspase-8 and caspase-9. Several other caspases, including caspase-3 and caspase-6, serve as executioners. Ref: Robbins, 8th edition, Chapter 1.', 'role': 'assistant'}]