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: Microbiology
[{'content': 'Which stain is used for staining fungal elements? \nSelect and explain. \nA. Acid fast stain, B. Methenamine silver, C. Mucicarmine, D. Ziehl-Neelsen stain', 'role': 'user'}, {'content': "Answer: B \nExplanation: Methenamine silver stains and the periodic acid schiff (PAS) are valuable methods for demonstration of fungal elements in tissue sections. Commonest culture media used in mycology are Sabouraud's glucose agar, Czapek-Dox medium, Cornmeal agar. Tissue sections like skin scrapings, are treated with 10% potassium hydroxide. The alkali digests cells and other tissue materials, enabling the fungal elements to be seen clearly. Do You Know: Only gram positive fungi is candida albicans. Ref: Ananthanarayanan & Paniker's textbook of microbiology Ed 8 Pg 601.", 'role': 'assistant'}]