This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Dienes stain is used for- 
Select and explain. 
A. Compylobactor, B. Helicobacter, C. Rickettsiae, D. Mycoplasma
D: Mycoplasma
Answer: D: Mycoplasma 
Explanation: Ans. is 'd' i.e., Mycoplasma * Dienes method (Dienes staining) - For colonies of mycoplasma.* Dienes phenomenon - To detect swarming of proteus.