question: In CST , what triggers a destructive immune response ?
answer: `` nonself '' entities ( e.g. , pathogens , an allograft )
turker_answer: In CST , `` nonself '' entities like pathogens or allografts triggers a destructive immune response .
rule-based: In CST , `` nonself '' entities ( e.g. , pathogens , an allograft triggers a destructive immune response .