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 of the following bacteria act by increasing CAMP- \nSelect and explain. \nA. Which of the following bacteria act by increasing CAMP-, B. Staphyloccus aureus, C. E. coli, heat stable toxin, D. Salmonella', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Vibrio cholerae . V. cholerae and heat labile toxin of E.coli cAMP . Heat stable toxin of E coli --> cGMP", 'role': 'assistant'}]