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: total 85 matches are conducted in knockout match type . how many players will be participated in that tournament ? 
Options: a ) 85 , b ) 81 , c ) 53 , d ) 82 , e ) 84
Example Output: e

Example Input: Problem: 19.19 / 2000 is equal to : 
Options: a ) 1.01252633 , b ) 0.01262533 , c ) 0.12526333 , d ) 0.012793333 , e ) 0.12725333
Example Output: d

Example Input: Problem: how many of the integers between 25 and 45 are even ? 
Options: a ) 21 , b ) 20 , c ) 11 , d ) 10 , e ) 9
Example Output:
d