In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: 998 x 998 = ?
Options: a ) 996000 , b ) 1000000 , c ) 996004 , d ) 4000 , e ) 996008
Example Output: c

Example Input: Problem: a batsman in his 12 th innings makes a score of 75 and thereby increases his average by 1 runs . what is his average after the 12 th innings if he had never been ' not out ' ?
Options: a ) 42 , b ) 43 , c ) 44 , d ) 64 , e ) 46
Example Output: d

Example Input: Problem: if a * b denotes the greatest common divisor of a and b , then ( ( 12 * 15 ) * ( 18 * 24 ) ) = ?
Options: a ) 24 , b ) 12 , c ) 6 , d ) 4 , e ) 3
Example Output:
e