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 is habitual of nose picking while cooking. His clients are at risk for food poisoning with: \nSelect and explain. \nA. Clostridia difficle, B. Staph aureus, C. Vibrio cholerae, D. Bacillus cereus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b. Staph aureus', 'role': 'assistant'}]