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: Microbiology
[{'content': "Method used for acid fast staining ? \nSelect and explain. \nA. Robeson's method, B. Ziehl Neelsen, C. Silver imprignation method, D. Dark ground illumination", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Ziehl Neelsen Acid fast staining After staining with aniline dye, acid fast organisms resist decolourisation with acids. Method most commonly used is modified Ziehl Neelsen.", 'role': 'assistant'}]