Task: Question Answering
Input (English): Problem: 5 women can do a work in two days . 10 men can complete the same work in five days . what is the ratio between the capacity of a man and a woman ? 
Options: a ) 1 : 2 , b ) 1 : 5 , c ) 2 : 3 , d ) 3 : 2 , e ) none of these
Output (English): b