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
[{'content': 'Clostridium tetani is: \nSelect and explain. \nA. Gram positive bacilli, B. Gram negative bacilli, C. Gram positive cocci, D. Gram negative cocci', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]