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': 'Preformed toxin produces diarrhea in which organism ? \nSelect and explain. \nA. Staphylococcus, B. Vibrio cholera, C. Salmonella, D. Escherichia coli', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Example of Preformed toxin i.e. toxin secreted in food: S.aureus enterotoxin, Bacillus cereus emetic type of enterotoxin\xa0and botulinum toxin.', 'role': 'assistant'}]