This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Amyloid deposit stain positively with all of the following except \nSelect and explain. \nA. Congo red, B. Crystal violet, C. Methanamine silver, D. Thioflavin T', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref Robbins 9/e p262 The Modified Gomori Methenamine-SilverNitrate Stain (GMS Stain) is intended for usein the histologic visualization of fungi, basement membrane and some oppounistic organisms such as Pneumocystis carinii.', 'role': 'assistant'}]