Task: Question Answering
Input (English): Question: A can do a piece of work in 10 days and B alone can do it in 15 days. How much time will both take to finish the work ?

 Option A: 2 days

 Option B: 7 days

 Option C: 6 days

 Option D: 9 days

 Option E: 3 days
Output (English): Option C