Task: Question Answering
Input (English): Problem: two digits in father ' s age are the same as the digit in the son ' s age , but in reverse order . in 5 years father will be twice as old as son will be then . what is the difference in their current age ? 
Options: a ) 18 , b ) 16 , c ) 34 , d ) 25 , e ) 12
Output (English): a