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 toxin is not mediated by cAMP 
Select and explain. 
A. V. cholera 01, B. Heat stable E.coli toxin, C. Heat labile E.coli toxin, D. V.cholera 0137
B: Heat stable E.coli toxin
Answer: B: Heat stable E.coli toxin 
Explanation: None