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: for what value of x between − 8 and 8 , inclusive , is the value of x ^ 2 − 10 x + 16 the greatest ? 
Options: a ) − 8 , b ) − 2 , c ) 0 , d ) 2 , e ) 8

Ex Output:
a


Ex Input:
Problem: if a is a positive integer , and if the units digit of a ^ 2 is 9 and the units digit of ( a + 1 ) ^ 2 is 4 , what is the units x digit of ( a + 2 ) ^ 2 ? 
Options: a ) 1 , b ) 3 , c ) 5 , d ) 6 , e ) c . 14

Ex Output:
a


Ex Input:
Problem: the sum of the present age of henry and jill is 43 . what is their present ages if 5 years ago henry was twice the age of jill ? 
Options: a ) and 27 , b ) and 24 , c ) and 22 , d ) and 29 , e ) of these

Ex Output:

a