Task: Question Answering
Input (English): Problem: sum of two numbers prime to each other is 15 and their l . c . m . is 56 . what are the numbers ? 
Options: a ) 9 and 8 , b ) 5 and 10 , c ) 7 and 9 , d ) 7 and 8 , e ) 10 and 8
Output (English): d