question: What did the 2012 study say was doubled by the use of GM cotton ?
answer: ladybirds , lacewings and spiders
turker_answer: The 2012 study said ladybirds , lacewings and spiders have doubled by the use of GM cotton .
rule-based: The 2012 study said ladybirds , lacewings and spiders was doubled by the use of GM cotton .