Task: Question Answering
Input (English): Context: There is a room full of vending machines . I had a 20 dollar bill and I wanted a Coke Zero . In a quiet hour , I walked down to the emergency department and asked the clerk if there was a cashier anywhere who took payments at night , so I could get change . He sent me to the security desk , staffed by a VA police officer who told me that there was no cashier anywhere , and no change machine he could think of . 
Question: Why could n't the narrator use the vending machine ?
Output (English): They could n't break the large bill .