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: what is the value of 10 ^ 7 - 6 ^ 5 ?
Options: a ) 99 , 91,223 , b ) 99 , 92,224 , c ) 99 , 94,265 , d ) 99 , 95,300 , e ) 99 , 96,307
Example Output: b

Example Input: Problem: if 5400 mn = k ^ 4 , where m , n , and k are positive integers , what is the least possible value of m + 2 n ?
Options: a ) 11 , b ) 18 , c ) 20 , d ) 25 , e ) 40
Example Output: e

Example Input: Problem: how many multiples of 5 are there between 5 to 100 ?
Options: a ) 9 , b ) 18 , c ) 17 , d ) none of these , e ) can not be determined
Example Output:
b