question: How does the hygiene hypothesis explain the increase in asthma ?
answer: a direct and unintended result of reduced exposure , during childhood , to non-pathogenic bacteria and viruses
turker_answer: The hygiene hypothesis explains the increase in asthma as a direct and unintended result of reduced exposure , during childhood , to non-pathogenic bacteria and viruses .
rule-based: The hygiene hypothesis explains the increase in asthma by a direct and unintended result of reduced exposure , during childhood , to non-pathogenic bacteria and viruses .