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': "Pearl's stain used to demonstrate the following in tissues ? \nSelect and explain. \nA. Hemosiderin, B. Fat, C. Reticulin, D. Fibrin", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hemosiderin Prussian blue reaction (Perl's iron stain), a stain most commonly used for hemosidern demonstration in tissue sections, impas blue colour to hemosiderin", 'role': 'assistant'}]