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
Which of the following organism does not cause invasive diarrhea 
Select and explain. 
A. Bacillus cereus, B. Aeromonassp, C. Rota virus, D. Shigella
A: Bacillus cereus
Answer: A: Bacillus cereus 
Explanation: 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.