Task: Question Answering
Input (English): Problem: a and b undertake to do a piece of work for rs . 600 . a alone can do it in 6 days while b alone can do it in 8 days . with the help of c , they finish it in 3 days . ! find the share of b . 
Options: a ) 225 , b ) 500 , c ) 75 , d ) 800 , e ) none 0 of them
Output (English): a