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: Pharmacology
[{'content': 'A person developed severe vomiting after eating food from chinese restaurant, 3 hours before. Most likely causative agent is: \nSelect and explain. \nA. Staph. aureus, B. B. cereus, C. C. difficle, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e. B. cereus", 'role': 'assistant'}]