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
Conversion of normal cell into their tombstones is the hallmark of: 
Select and explain. 
A. Coagulative necrosis., B. Liquefaction necrosis., C. Caseous necrosis., D. Gangrenous necrosis.
A: Coagulative necrosis.
Answer: A: Coagulative necrosis. 
Explanation: None