Task: Question Answering
Input (English): Problem: what is the hcf of 2 / 3 , 4 / 10 and 6 / 5 
Options: a ) 7 / 45 , b ) 1 / 15 , c ) 4 / 15 , d ) 8 / 45 , e ) 9 / 45
Output (English): b