This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Microbiology
Bacillus Anthrax is: 
Select and explain. 
A. Gram positive cocci in cluster, B. Gram positive rods with square ends, C. Gram positive bacili with spherical ends, D. Gram negative cocci in cluster
B: Gram positive rods with square ends
Answer: B: Gram positive rods with square ends 
Explanation: Gram Positive bacilli Bacillus Anthrax. Gram positive rods with square ends ( non bulging spore) (bulging spore seen in cl. tetani) GPB, Non Motile, capsulated. Mc fadyeans reaction M - Mc'fadyean reaction Medusa Head appearance I - Inveed fir tree appearance S - String of pearl reaction Bamboo - Bamboo stick appearance ( on Gram stain)