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': 'The function of B subunit of cholera toxin is ? \nSelect and explain. \nA. ADP ribosylation of G protein, B. To bind GM1 ganglioside receptor, C. To stabilize cholera toxin, D. To increase cGMP', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., To bind GM1 ganglioside receptor", 'role': 'assistant'}]