This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Staphylococci, Subject name: Microbiology
[{'content': 'Which of the following is a superantigen - \nSelect and explain. \nA. Exfoliative toxin of staphylococcus, B. Lipopolysaccharide of gram negative bacteria, C. Enterotoxin of V cholerae, D. Shiga toxin of EHEC', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Exfoliative toxin of staphylococcus Examples of superantigeny Staphylococcal toxic shock syndrome toxiny Staphylococcal enterotoxinsy Staphylococcal exfoliative (erythrogenic) toxiny Streptococcal toxic shock syndrome toxiny Certain nonhuman retroviral proteinsy Yersinia pseudotuberculosisy Mycoplasma arthritis.y Mouse mammary tumor virus.", 'role': 'assistant'}]