Task: Question Answering
Input (English): Problem: if the sides of a cube are in the ratio 5 : 3 . what is the ratio of their diagonals ? 
Options: ['a ) 5 : 9', 'b ) 9 : 3', 'c ) 5 : 4', 'd ) 3 : 5', 'e ) 5 : 3']
Output (English): e