Task: Question Answering
Input (English): Problem: the compound ratio of 5 : 6 , 5 : 2 and 4 : 5 ? 
Options: a ) 1 : 1 , b ) 5 : 3 , c ) 1 : 6 , d ) 1 : 9 , e ) 1 : 2
Output (English): b