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': 'Which of the following organism does not cause invasive diarrhea \nSelect and explain. \nA. Bacillus cereus, B. Aeromonassp, C. Rota virus, D. Shigella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Bacillus cereus) Bacillus cereus causes non invasive diarrhea secondary to small bowel hypersecretion, as a result of preformed bacterial toxins. Rotavirus, Aeromonas sp and Shigella are all invasive organism known to cause invasive diarrhea.', 'role': 'assistant'}]