This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron Deficiency and Megaloblastic Anemia, 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 o Prussian blue reaction (Perl's iron stain), a stain most commonly used for hemosidem demonstration in tissue sections, imparts blue colour to hemosiderin