Task: Question Answering
Input (English): By inserting a gene into crop plants, scientists have developed plants that are resistant to insects. If an insect eats the plant, the insect dies. Which practice is unnecessary with this new plant variety?  
 (A) eroding the land by tilling (B) overproducing food crops (C) removing weeds from crops (D) spraying plants with pesticides
Output (English): D