Task: Question Answering
Input (English): Problem: the compound ratio of 1 : 3 , 1 : 2 and 1 : 5 ? 
Options: a ) 1 : 30 , b ) 1 : 5 , c ) 1 : 7 , d ) 1 : 1 , e ) 1 : 6
Output (English): a