This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Pathology
[{'content': 'Prusian blue detects? \nSelect and explain. \nA. Ferric iron, B. Ferrous iron, C. Glycogen, D. Lipids', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ferric iron o Perl's iron stain/Prussian blue method: It is the classic method for demonstrating iron in tissues. The section is treated with dilute hydrochloric acid to release ferric ions from binding proteins. These ions then react with potassium ferrocyanide to produce an insoluble blue compound (hydrated ferric ferrocyanide substance) (the Prussian blue reaction)Other optionso Lipid staining - Oil -Red - Oo Glycogen staining - PAS", 'role': 'assistant'}]