Task: Question Answering
Input (English): Question: A can do a job in 15days and B in 20days. If they work on it together for 4 days, then the fraction of the work that is left is?

 Option A: 2/15

 Option B: 8/15

 Option C: 3/11

 Option D: 1/12

 Option E: 6/13
Output (English): Option B