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
False about bacillus anthrax is 
Select and explain. 
A. Gram negative, B. Bacilli in long chain, C. Non haemolytic colony in blood agar, D. Medusa head appearance on nutrient agar
A: Gram negative
Answer: A: Gram negative 
Explanation: 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