Task: Question Answering
Input (English): Problem: the smallest value of n , for which 2 n is not a prime number , is 
Options: a ) 2 , 3,4 , b ) 1 , 3,5 , c ) 2 , 5,6 , d ) 4 , 8,9 , e ) 12 , 14,16
Output (English): a