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
Amyloid deposit stain positively with all of the following except 
Select and explain. 
A. Congo red, B. Crystal violet, C. Methanamine silver, D. Thioflavin T
C: Methanamine silver
Answer: C: Methanamine silver 
Explanation: 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.