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
[{'content': 'Patient having gastroenteritis after eating contaminated food.microscopy showed gram-positive bacillus with subterminal spore. The bacteria is \nSelect and explain. \nA. Clostridium per fringes, B. Staphylococcus, C. Clostridium tetani, D. Corynebacterium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Clostridium-gram positive bacillus Food poisoning -clostridium perfringes Ref: Textbook of Microbiology Baveja 4th ed Pg 591', 'role': 'assistant'}]