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
[{'content': '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 \ninvestigations, the cook is found to be carrier of: \nSelect and explain. \nA. Salmonella typhi, B. Vibrio cholerae, C. Entamoeba histolytica, D. Staphylococcus aureus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Learn this table by heart, every year there is a question on food poisoning.', 'role': 'assistant'}]