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
A cook prepares sandwitches for 10 people going for picnic. Eight out of them develop severe gastroenteritis within 4-6 hrs of consumption of the sandwitches. It is likely that on investigations the cook is found to be the carrier of - 
Select and explain. 
A. Salmonella typhi., B. Vibrio cholerae, C. Entamoeba histolytica, D. Staphylococcus aureus
D: Staphylococcus aureus
Answer: D: Staphylococcus aureus 
Explanation: None