This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reversible Cell Injury, Subject name: Pathology
[{'content': 'Intracellular calcification begins in which of the following organelles? \nSelect and explain. \nA. Mitochondria, B. Golgi body, C. Lysosomes, D. Nucleus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Calcium may be deposited at sites of cell death, resulting in pathologic calcification. Initiation of intracellular calcification occurs in the mitochondria of dead or dying cells that accumulate calcium.', 'role': 'assistant'}]