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
[{'content': 'Me fayden reaction seen with which organism - \nSelect and explain. \nA. Clostridium perfringens, B. Clostridium botulinum, C. Bacillus cereus, D. Bacillus anthracis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Bacillus antracis M' FadyeaiTs reaction* When blood films containing anthrax bacilli are stained with polychrome methylene blue for a few seconds and examined under microscope, an amorphous purplish material is noticed around bacilli. This represents the capsular material and is characteristic of the anthrax bacillus.", 'role': 'assistant'}]