Task: Question Answering
Input (English): Question: A and B can do a work in 15days, B and C in 30days, C and A in 45days. If A,B and C work together , they will complete the work in?

 Option A: 10days

 Option B: 16days

 Option C: 20days

 Option D: 25days

 Option E: 22days
Output (English): Option B