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: Unknown
Superantigen include all, except: 
Select and explain. 
A. TSST, B. Exfoliative toxin, C. Pyrogenic exotoxin, D. Cholera toxin
D: Cholera toxin
Answer: D: Cholera toxin 
Explanation: Superantigens are certain proteinmolecules that activate very large number of T cells irrespective of antigenic specifities
They bind directly to lateral aspect of TCR β chain and activate upto 20% of the circulating T cells compared to conventional (0.001%) causing multisystem dysfunction.
Examples :
Toxic shock syndrome toxin
Exfoliative toxin
Staphylococcal anterotoxin
Pyrogenic exotoxin