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
Toxins are implicated as the major pathogenic mechanism in all of the following bacterial diarrheas except - 
Select and explain. 
A. Vibrio cholerae, B. Shigella sp, C. Vibrio parahemolyticus, D. Staphylococcus aureus
C: Vibrio parahemolyticus
Answer: C: Vibrio parahemolyticus 
Explanation: Ans. is 'c' i.e., Vibrio parahemolyticus "No enterotoxin has been identified with vibrio parahemolyticus. The vibrio is believed to cause enteritis by invasion of the intestinal epithelium"