This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Food poisoning in "Canned food" is usually due to: \nSelect and explain. \nA. Staphylococcus, B. Salmonella, C. Clostridia, D. Bacillus cereus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Clostridia', 'role': 'assistant'}]