Task: Question Answering
Input (English): Passage: About one time a week I change my bed sheets . First I remove the top and bottom sheet from the bed and put them where I put my dirty clothes to be washed later . Next I get the bottom sheet .  I use a fitted bottom sheet .  A bottom fitted sheet has elastic on the corners to kind of like hook around the corners of the bed .  Next I get the top sheet . This is the easy part . I unfold it and spread it over the top of the bed .  Then at the foot end of the bed I push the sheet in between the top mattress and the box springs .  And I do the same thing for the sides of the sheet .  Then I do all this again next week . Question: What helps the sheet stay on the bed? Option1: Elastic on corners. Option2: buttons
Output (English): Elastic on corners.