Task: Question Answering
Input (English): Context: Thursday morning when I went to put my walking shoes on by the front door , I noticed several ants crawling around on the floor . Where did those come from ? I never had ants in here before . Since then I have been finding ants on the living room floor , and now in the kitchen . 
Question: What 's a possible reason there were ants crawling around on the floor ?
Output (English): Because there was some food spilled or left out .