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-a) Botulinum toxinb)  Shiga toxinc) V.cholerae toxin d) Diphtheria toxine) Pertussis toxin \nSelect and explain. \nA. cde, B. acd, C. bde, D. ade', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]