This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'Stain used for melanin- \nSelect and explain. \nA. Masson Fontana, B. Prussain blue, C. Masson trichrome, D. Congo red', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HARSH MOHAN Textbook of pathology 6th edition pg no 13 TABLE 2.1: Common Special (Histochemical) Stains in Surgical Pathology (in Alphabetic Order of Constituents). Stain: Masson Fontana Component/Tissue: Melanin, argentaffin cells Dyes: Silver nitrate Interpretation:Melanin, argentaffin,chromaffin, lipofuscin: black Nuclei: red HARSH MOHAN Textbook of pathology 6th edition pg no 13', 'role': 'assistant'}]