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 stimulate adenylate cyclase with G-protein coupled action ? \nSelect and explain. \nA. Shiga toxin, B. Cholera toxin, C. Diphtheria toxin, D. Pseduomonas toxin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Cholera toxin", 'role': 'assistant'}]