This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, 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: Periodic acid schiff stain is a special stain used to demonstrate fungal elements. fungal cell wall and yeasts contain neutral polysaccharides that stain positive with pas reaction fungal cell wall appear red. rooks textbook of dermatologypage 92', 'role': 'assistant'}]