This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which of the following staphylococcal protein is a superantigen- 
Select and explain. 
A. Exfoliative toxin, B. Cytolytic toxin, C. ProteinA, D. Leucocidin
A: Exfoliative toxin
Answer: A: Exfoliative toxin 
Explanation: Ans. is 'a' i.e., Exfoliative toxin Examples of superantigeno Staphylococcal toxic shock syndrome toxino Staphylococcal enterotoxinso Staphylococcal exfoliative (erythrogenic) toxino Streptococcal toxic shock syndrome toxino Certain nonhuman retroviral proteinso Yersinia pseudotuberculosiso Mycoplasma arthritis,o Mouse mammary' tumor virus.