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
Which of the following bacteria act by increasing cAMP 
Select and explain. 
A. Staphylococcus aureus, B. E. coli heat stable toxin, C. Vibrio cholera, D. Salmonella
C: Vibrio cholera
Answer: C: Vibrio cholera 
Explanation: Cholera produces a potent enterotoxin known as cholera toxin.
This toxin consists of