This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Streptococcal Toxic shock syndrome is due to the following virulence factor : \nSelect and explain. \nA. M protein, B. Pyrogenic exotoxin, C. Streptolysin O., D. Carbohydrate cell wall.', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Pyrogenic exotoxin Streptococcal toxic shock syndrome is caused due to the release of pyrogenic exotoxins or erythrogenic exotoxins. * These exotoxins are produced only by few strains of beta hemolytic group A streptococci. *Usually these toxins cause scarlet fever but sometimes these strains produce exotoxins that are superantigens.These superantigens (exotoxins) directly super stimulate T cells to pour out inflammatory cytokines. This causes streptococcal toxic shock syndromeMore questions on erythrogenic or pyrogenic exotoxinsDick testIt is a test used to identify children susceptible to scarlet fever.Intradermal injection of erythrogenic toxin into susceptible individual produces an erythematous reaction.Schultz Charlton reactionIt is a diagnostic test for scarlet fever.Blanching of the rash produced during scarlet fever on local injection of convalescent serum is called Schultz Charlton reaction.Also know:", 'role': 'assistant'}]