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: Unknown
[{'content': '16-year-old boy had a flea bite while working in a wheat grain godown. After 4 days he developed fever and had axillary lymphadenopathy. The stain used for smear preparation is ? \nSelect and explain. \nA. Albert staining, B. Ziehl Neelson staining, C. McFadyean’s staining, D. Wayson staining', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • This is a case of plague—Working in godown (rats commonly found)\n• H/o flea bite, In patient 5 days, fever and lymphadenopathy.\n• Wayson stain a polychromatic stain-Y. Pestis can be best demonstrated (other is Giemsa)\n• Bipolar staining or safety pin appearance seen.\n•Albert stain use for C. diptheriae\n• Z-N stain use for M. tuberculosis and other acid fast bacteria\n• Mc Fayden reaction used for B. anthracis', 'role': 'assistant'}]