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': 'Staphylococcus aureus causes vomiting in 2-6 hours. The mechanism of action is by \nSelect and explain. \nA. Stimulation of cyclic AMP, B. Vagal stimulation, C. Stimulation of Cyclic GMP, D. Acts through ganglioside GM receptor', 'role': 'user'}, {'content': "Answer: B \nExplanation: It has been suggested that SEs(staph enterotoxins) stimulate the vagus nerve in the abdominal viscera, which transmits the signal to the vomiting center in the brain. Enterotoxin is responsible for the manifestations of staph food poisoning - nausea, vomiting, and diarrhea 2-6 hr after consuming food contaminated with enterotoxin. The toxin directly acts on ANS to cause the illness rather than on the gastrointestinal mucosa. Ref: Textbook of Microbiology; Ananthanarayan and Paniker's; 10th Edition; Page No: 204.", 'role': 'assistant'}]