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
Diptheria toxin acts by- 
Select and explain. 
A. inhibiting acetyl choline release, B. inhibiting protein synthesis, C. inhibiting glucose transport, D. increasing level of cyclic AMP.
B: inhibiting protein synthesis
Answer: B: inhibiting protein synthesis 
Explanation: None