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
[{'content': 'Which toxin is not mediated by cAMP- \nSelect and explain. \nA. V. cholera 01, B. Heat stable E.coli toxin, C. Heat labile E.coli toxin, D. V.cholera 0137', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Heat Stable E.coli toxin . Heat labile toxin of E. coli and cholera toxin resemble each other in their structure, antigenic propeies and mode ofaction. Both act by activating adenyl cyclase in the enterocyte to form cyclic adenosine 5' monophosphate (c AMP). . Heat stable toxin of E. coli acts by activation of cyclic guanosine monophosphate (c GMP) in the intestine.", 'role': 'assistant'}]