Task: Question Answering
Input (English): About a month later , I shot up 20 lbs over a two week period . I was dieting and exercising at the time , so I checked my weight weekly . Nothing was wrong with the scale , I've checked it elsewhere and everyone else in my house has used it and seen no changes . 
Question: What may have caused you to gain 20 lbs ?
Output (English): I can't determine the reason .