This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Food poisoning after 1-5 hours of consumption of ice cream, causative organism is \nSelect and explain. \nA. Staphylococcus aureus, B. Bacillus cereus, C. Salmonella, D. Vibrio parahemolyticus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Enterotoxin is responsible for the manifestation of staphylococcal food poisoning- nausea, vomiting, and diarrhea 2-6 hrs after consuming food contaminated by the preformed toxin. The toxin is believed to act directly on the autonomous nervous system to cause the illness, rather than on the gastrointestinal mucosa. Ref: Textbook of Ananthanarayan and paniker's; 10th Edition; Pg:204", 'role': 'assistant'}]