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 metastatic calcification? \nSelect and explain. \nA. Psammoma bodies, B. Rheumatic heart disease, C. Milk alkali syndrome, D. Monckeberg's medial calcific sclerosis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Metastatic calcification occurs when there is raised calcium level.', 'role': 'assistant'}]