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': 'Diptheria toxin acts by- \nSelect and explain. \nA. inhibiting acetyl choline release, B. inhibiting protein synthesis, C. inhibiting glucose transport, D. increasing level of cyclic AMP.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]