This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Metastatic calcification is most commonly seen in \nSelect and explain. \nA. Cornea, B. Extensor tendons, C. Brain, D. Renal tubules', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Metastatic calcification may occur in normal tissues whenever there is hypercalcemia. Metastatic calcification may occur widely throughout the body but principally affects the interstitial tissues of the gastric mucosa, kidneys, lungs, systemic aeries, and pulmonary veinsReference: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Chapter 2; Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death', 'role': 'assistant'}]