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': '"Gamma Gandy" bodies contains hemosiderin and: \nSelect and explain. \nA. Na+, B. Ca++, C. Mg++, D. Ca', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ca', 'role': 'assistant'}]