This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cellular Pathology, Subject name: Pathology
[{'content': 'Ladder pattern of DNA electrophoresis is seen in \nSelect and explain. \nA. Necrosis, B. Apoptosis, C. Cytolysis, D. Karyorrhexis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Apoptosis(Ref: Robbins 9th/pg 53; R 9th/pg 29-30)DNA breakdown (Internucleosome cleavage by endonuclease into 200 bp oligonucleosomes is a characteristic)Q at specific sites can be detected by 'step ladder pattern' on gel electrophoresis or TUNEL (TdT mediated d-UTP Nick End Labelling) technique", 'role': 'assistant'}]