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
Pearl's stain used to demonstrate the following in tissues ? 
Select and explain. 
A. Hemosiderin, B. Fat, C. Reticulin, D. Fibrin
A: Hemosiderin
Answer: A: Hemosiderin 
Explanation: 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