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 of the following is the characteristic of irreversible injury on electron microscopy? \nSelect and explain. \nA. Disruption of ribosomes, B. Amorphous densities in mitochondria, C. Swelling of Endoplasmic reticulum, D. Cell swelling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: One of the characteristic features of irreversible injury on electron microscopy is marked dilation of mitochondria with the appearance of large amorphous densities.', 'role': 'assistant'}]