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: the average of first seven prime numbers which are between 30 and 70 is 
Options: a ) 35.4 , b ) 42 , c ) 44.4 , d ) 57 , e ) 67

Ex Output:
c


Ex Input:
Problem: a man is 24 years older than his son . in six years , his age will be twice the age of his son . the present age of the son is 
Options: a ) 14 years , b ) 28 years , c ) 20 years , d ) 22 years , e ) none

Ex Output:
e


Ex Input:
Problem: how many natural numbers are there between 43 and 200 which are exactly divisible by 6 ? 
Options: a ) 26 , b ) 25 , c ) 24 , d ) 22 , e ) 23

Ex Output:

a