Task: Question Answering
Input (English): Problem: arnold and danny are two twin brothers that are celebrating their birthday . the product of their ages today is smaller by 13 from the product of their ages a year from today . what is their age today ? 
Options: a ) 2 . , b ) 6 . , c ) 5 . , d ) 7 . , e ) 9 .
Output (English): b