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': 'Amyloid deposits stain positively with all of the following except: \nSelect and explain. \nA. Congo-red, B. Methenamine silver, C. Crystal violet, D. Thioflavin T', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Staining Characteristics of Amyloid', 'role': 'assistant'}]