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
Which of the following toxins acts by inhibiting protein synthesis - 
Select and explain. 
A. Cholera toxin, B. Shiga toxin, C. Pertussis toxin, D. LT of enterotoxigenic E.coli
B: Shiga toxin
Answer: B: Shiga toxin 
Explanation: Toxin which acts by inhibiting protein synthesis:

Diphtheria toxin and Pseudomonas Exotoxin A: Inhibiting elongation factor 2
Shiga toxin and Verotoxin (Shiga like toxin) of EHEC: Inhibiting 60s ribosome