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'.

Ex Input:
Problem: a house wife saved $ 2.50 in buying an item on sale . if she spent $ 25 for the item , approximately how much percent she saved in the transaction ? 
Options: a ) 8 % , b ) 9 % , c ) 10 % , d ) 11 % , e ) 12 %

Ex Output:
b


Ex Input:
Problem: the largest 5 digit number exactly divisible by 91 is : 
Options: a ) 25698 , b ) 581396 , c ) 369741 , d ) 99918 , e ) 1258

Ex Output:
d


Ex Input:
Problem: 3 - 5 * 6 + 2 = 
Options: a ) a ) 2 , b ) b ) - 13 , c ) c ) - 18 , d ) d ) - 17 , e ) e ) - 25

Ex Output:

e