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: Social & Preventive Medicine
[{'content': 'At 1:00 pm a mother got a phone call from the school to pick her son who was a student of III class, as he was having excessive vomiting. The child was taken immediately to the Hospital where he admitted that he had taken ice-cream in lunch break at 11:30 am. Most likely he was suffering from food poisoning due to \nSelect and explain. \nA. Salmonella, B. Staph aureus, C. Shigella, D. Vibrio cholera', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]