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
The following are example of apoptosis except? 
Select and explain. 
A. Graft versus host disease, B. Menstrual cycle, C. Pathological atrophy following duct obstruction, D. None
D: None
Answer: D: None 
Explanation: Ans. is 'None'