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': 'Most pathognomonic sign of irreversible cell injury: \nSelect and explain. \nA. Amorphous densities in mitochondria, B. Swelling of the cell membrane, C. Ribosomes detached from endoplasmic reticulum, D. Clumping of nuclear chromatin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Amorphous densities in mitochondria', 'role': 'assistant'}]