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
[{'content': 'Which is the characteristic feature of apoptosis: \nSelect and explain. \nA. Nuclear Pyknosis., B. Cellular shrinkage., C. Chromatin clumping., D. Intact cell membrane.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most characteristic feature is the nuclear pyknosis.\xa0\nOther\xa0\n\nCellular shrinkage\xa0\nChromatin clumping\xa0\nIntact cell membrane\xa0\nCytoplasmic eosinophilia', 'role': 'assistant'}]