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
Amyloid deposits stain positively with all of the following except 
Select and explain. 
A. Congo Red, B. Crystal violet, C. Methenamine silver, D. Thioflavin ?
C: Methenamine silver
Answer: C: Methenamine silver 
Explanation: . Methenamine silver