<prompt> Perls stain is used to demonstrateMelaninHaemosiderinBilirubinLipofuscin  <response>: B Haemosiderin Hemosiderosis: With progressive accumulation of hemosiderin, parenchymal cells throughout the body principally in the liver, pancreas, heart, endocrine organs become pigmented, iron can be visualized in tissues by the Prussian blue histochemical reaction, in which colorless potassium ferrocyanide is converted by iron to blue-black ferric ferrocyanide. Perls Prussian Blue Stain for Iron-Positive Cells e.g., activated macrophages a.k.a. Perls acid ferrocyanide reaction 