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: 12.1212 + 17.0005 - 9.1103 = ? 
Options: a ) 20.0015 , b ) 20.0105 , c ) 20.0115 , d ) 20.0114 , e ) none

Ex Output:
d


Ex Input:
Problem: find a sum for 1 st 7 prime number ' s ? 
Options: a ) 25 , b ) 28 , c ) 58 , d ) 34 , e ) 36

Ex Output:
c


Ex Input:
Problem: how much is 60 % of 40 is greater than 4 / 5 of 25 ? 
Options: a ) 4 , b ) 6 , c ) 10 , d ) 8 , e ) 13

Ex Output:

a