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
Which of the following has a Direct role in Apoptosis. 
Select and explain. 
A. NO, B. Adenyl cyclise, C. C AMP, D. Cytochrome C
D: Cytochrome C
Answer: D: Cytochrome C 
Explanation: Cytochrome C