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: B \nExplanation: Ca"', 'role': 'assistant'}]