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': 'In apoptosis, Apaf-1 is activated by release of which of the following substance from the mitochondria? (NOT RELATED) \nSelect and explain. \nA. Bcl-2, B. Bax, C. Bcl-XL, D. Cytochrome C', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]