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: a positive number x is multiplied by 5 , and this product is then divided by 3 . if the positive square root of the result of these two operations equals x , what is the value of x ?
Options: a ) 9 / 4 , b ) 3 / 2 , c ) 4 / 3 , d ) 5 / 3 , e ) 1 / 2

Ex Output:
d

Ex Input:
Problem: how many numbers from 10 to 1000 are exactly divisible by 9 ?
Options: a ) 100 , b ) 10 , c ) 11 , d ) 12 , e ) 14

Ex Output:
a

Ex Input:
Problem: is two years older than b who is twice as old as c . if the total of the ages of a , b and c be 27 , then how old is b ?
Options: a ) 7 , b ) 8 , c ) 9 , d ) 10 , e ) 11

Ex Output:
d