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
Which of the following is the negative stain 
Select and explain. 
A. Fontana, B. ZN stain, C. Nigrosin, D. Alber stain
C: Nigrosin
Answer: C: Nigrosin 
Explanation: Ref Robbins 9/e p 69 Negative staining is a techinque in which the background is stained.leaving the actual specimen untouched and thus visible, in contrast with positive staining ,the actual specimen is stained