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: each child has 2 pencils and 13 skittles . if there are 15 children , how many pencils are there in total ? 
Options: a ) 30 , b ) 12 , c ) 18 , d ) 22 , e ) 08

Ex Output:
a


Ex Input:
Problem: a father said his son , ` ` i was as old as you are at present at the time of your birth . ` ` if the father age is 32 now , the son age 5 years back was 
Options: a ) 11 , b ) 17 , c ) 11 , d ) 19 , e ) 99

Ex Output:
a


Ex Input:
Problem: the average age of a family of 5 members is 20 years . if the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member ? 
Options: a ) 13.5 , b ) 14 , c ) 15 , d ) 12.5 , e ) none

Ex Output:

d