This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'Hea failure cells are stained by? \nSelect and explain. \nA. Alcian blue, B. Silver stains, C. Prussian blue, D. PAS', 'role': 'user'}, {'content': "Answer: C \nExplanation: Hea failure cells: Hemosiderin-laden macrophages Found in lung affected by CVC lung and not in the hea. Hemosiderin pigment in these cells stains blue with Prussian blue stain (Perl's stain).", 'role': 'assistant'}]