This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Largest pathogenic Bacillus organism is - 
Select and explain. 
A. Bacillum subtilis, B. Bacillum cereus, C. Bacillum anthrocis, D. Bacillum megaterism
C: Bacillum anthrocis
Answer: C: Bacillum anthrocis 
Explanation: The anthrax bacillus is one of the largest of pathogenic bacteria measuring 3-10 x 1-16 um. It resembles a Bamboo stick appearance Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 244