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': '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: ANSWER: (A) StaphylococcusREF: Harrison\'s 17 edition, table 40.2See APPENDIX-22 for "ACUTE INFECTIOUS DIARRHEA"', 'role': 'assistant'}]