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': 'Which of the following is a special stain used to diagnose fungal hyphae in tissues - \nSelect and explain. \nA. Masson trichome, B. Silver methenamine, C. Congo red, D. Alizarin red', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Silver methenamine', 'role': 'assistant'}]