Task: Question Answering
Input (English): Question: 5 men and 12 boys finish a piece of work in 4 days, 7 men and 6 boys do it in 5 days. The ratio between the efficiencies of a man and boy is?

 Option A: 6:9

 Option B: 6:89

 Option C: 6:0

 Option D: 6:5

 Option E: 6:1
Output (English): Option D