Task: Question Answering
Input (English): Problem: if 4 a = 5 b and ab ≠ 0 , what is the ratio of a / 5 to b / 4 ? 
Options: a ) 125 / 64 , b ) 25 / 16 , c ) 1 , d ) 4 / 5 , e ) 64 / 125
Output (English): c