This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Staining done for sebaceous cell carcinoma - \nSelect and explain. \nA. Oil Red O, B. PAS, C. Methamine silver, D. KOH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Oil Red O', 'role': 'assistant'}]