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: 8 ^ 100 is divisible by 17 . find the remainder ?
Options: a ) 10 , b ) 12 , c ) 16 , d ) 18 , e ) 20

Ex Output:
c

Ex Input:
Problem: what is the least whole number that should be added to 784839 if it is to be divisible by 10 ?
Options: a ) 3 , b ) 2 , c ) 1 , d ) 5 , e ) 6

Ex Output:
c

Ex Input:
Problem: when 2 is added to half of one - third of one - fifth of a number , the result is one - fifteenth of the number . find the number ?
Options: a ) 40 , b ) 65 , c ) 73 , d ) 60 , e ) 80

Ex Output:
d