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 distance from the x - axis to point p is half the distance from the y - axis to point p . if the coordinates of p are ( x , - 4 ) , how many units is p from the y - axis ? 
Options: a ) 2 , b ) 4 , c ) 8 , d ) 10 , e ) 12

Ex Output:
c


Ex Input:
Problem: 1 , 6 , 16 , 31 , 51 , ( . . . . ) 
Options: a ) 61 , b ) 66 , c ) 76 , d ) 86 , e ) 83

Ex Output:
b


Ex Input:
Problem: the average age of an adult class is 40 years . 12 new students with an avg age of 32 years join the class . therefore decreasing the average by 6 year . find what was the original average age of the class ? 
Options: a ) 10 , b ) 12 , c ) 16 , d ) 20 , e ) 4

Ex Output:

e