This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'False about bacillus anthrax is \nSelect and explain. \nA. Gram negative, B. Bacilli in long chain, C. Non haemolytic colony in blood agar, D. Medusa head appearance on nutrient agar', 'role': 'user'}, {'content': "Answer: A \nExplanation: The Bacillus anthrax is one of the largest of pathogenic bacteria. It is Gram-positive but tends to be decolorized easily so as to appear Gram-variable or even Gram-negative. It is non-acid fast. It is non-motile. Reference: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg: 249", 'role': 'assistant'}]