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': "Which of the following stains is used to study fungal morphology in tissue sections – \nSelect and explain. \nA. PAS, B. Von–kossa, C. Alzarin–red, D. Masson's Trichrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: "The periodic acid schiff (PAS) and methenamine silver stains are valuable methods for the demonstration of fungal elements in tissue sections."', 'role': 'assistant'}]