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': 'Lipid in tissue is detected by- \nSelect and explain. \nA. Oil Red, B. Muciramine, C. PAS, D. Myeloperoxidase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Special stains for fat: Frozen sections stained with Sudan IV or Oil Red-O give an orange-red color to the fat. Osmic acid gives a black color Oil Red O is a lysochrome diazo dye used for staining of neutral triglycerides and lipids on frozen sections and some lipoproteins on paraffin sections. It has the appearance of a red powder with maximum absorption at 518 nm', 'role': 'assistant'}]