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: Dental
[{'content': 'Mucin in mucous cells usually demonstrated by \nSelect and explain. \nA. PAP stain, B. H & E stain, C. Mucicarmine stain, D. Mallory stain', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]