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
Clostridium tetani is: 
Select and explain. 
A. Gram positive bacilli, B. Gram negative bacilli, C. Gram positive cocci, D. Gram negative cocci
A: Gram positive bacilli
Answer: A: Gram positive bacilli 
Explanation: Ans. is 'a' i.e., Gram positive bacilli(Ref: Ananthanarayan, 9th/e, p. 259 and 8th/e, p. 256)*All Clostridia are anaerobic, spore forming, gram positive bacilli.