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 acts by ADP ribosylation- \nSelect and explain. \nA. Botulinum toxin, B. Shiga toxin, C. V.cholerae toxin, D. All', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., V. cholerae toxin", 'role': 'assistant'}]