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 is the hallmark of programmed cell death ? 
Select and explain. 
A. Apoptosis, B. Coagulation necrosis, C. Fibrinoid necrosis, D. Liquefaction necrosis
A: Apoptosis
Answer: A: Apoptosis 
Explanation: Ans. is 'a' i.e., Apoptosis