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': 'Verocytotoxin of E. coli acts by - \nSelect and explain. \nA. Increasing cAMP, B. Decreasing cAMP, C. Decreasing protein synthesis, D. Decreasing cGMP', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Decreasing protein synthesis", 'role': 'assistant'}]