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
Non invasive diarrhea is caused by: 
Select and explain. 
A. Shigella, B. B. Cereus, C. Salmonella, D. Y. enterocolitica
B: B. Cereus
Answer: B: B. Cereus 
Explanation: 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.