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': 'True about metastatic calcification: \nSelect and explain. \nA. Serum ca level is normal, B. Occurs in dead/dying tissue, C. Occurs in damaged heart valves, D. Calcification starts in mitochondria', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Calcification starts in mitochonda(Ref: Robbins 9th/pg 65)Calcification begins in mitochondria QThe prime abnormality is due to pathological entry of large amount of calcium into organelle especially mitochondria', 'role': 'assistant'}]