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
Staph. aureus causes vomiting in 16-18 hours. The mechanism of action is - 
Select and explain. 
A. Stimulation of cy AMP, B. Vagal stimulation, C. Stimulation of CyGMP, D. Acts through ganglioside GM receptor
B: Vagal stimulation
Answer: B: Vagal stimulation 
Explanation: Ans. is 'b' i.e., Vagal stimulation