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: if x / y = 7 / 3 , then ( x + y ) / ( x - y ) = ? 
Options: a ) 5 , b ) 5 / 2 , c ) - 1 / 6 , d ) - 1 / 5 , e ) - 5

Ex Output:
b


Ex Input:
Problem: how many numbers between 190 and 580 are divisible by 45 and 6 ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10

Ex Output:
a


Ex Input:
Problem: find the value of ( 19 + 43 / 151 ) × 151 
Options: a ) 2924 , b ) 2916 , c ) 2614 , d ) 2912 , e ) 2215

Ex Output:

d