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: Medicine
[{'content': 'Non invasive diarrhea is caused by: \nSelect and explain. \nA. Shigella, B. B. Cereus, C. Salmonella, D. Y. enterocolitica', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (B. cereus) Bacillus cereus causes non invasive diarrhea due to preformed enterotoxins Shigella, Salmonella and Y. enterocolitica are causes of invasive diarrhea.', 'role': 'assistant'}]