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: Microbiology
Micro-organisms invading the GIT causing gasteroenteritis - 
Select and explain. 
A. EHEC, B. Shigella, C. Vibryo parahemolyticus, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., EHEC, 'b' i.e., Shigella, 'c' i.e., Vibryo parahemolyticus Invasion of the intestinal epithelium occurs in? . Shigella . Salmonella sp. . Campylobacter . EHEC & EIEC . Vibrio parahemolyticus . Yersinia parahemolyticus . C. difficale . E. histolytica