Task: Question Answering
Input (English): Question: A can do a job in 30days and B in 40days. If they work on it together for 10 days, then the fraction of the work that is left is?

 Option A: 2/11

 Option B: 3/13

 Option C: 5/12

 Option D: 7/10

 Option E: 6/15
Output (English): Option C