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 c-AMP - 
Select and explain. 
A. Vibrio cholera, B. Staphylococcus aureus, C. E. coli, heat stable toxin, D. Salmonella
A: Vibrio cholera
Answer: A: Vibrio cholera 
Explanation: Toxin acts by cAMP are: LT of E.coli, Cholera toxin, Pertussis toxin, Anthrax toxin (edema factor).