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: ages of two sisters differ by 9 years . if 5 years ago , the elder one was twice as old the younger one , find their present age 
Options: a ) 1228 , b ) 1423 , c ) 1632 , d ) 1834 , e ) 1932

Ex Output:
b


Ex Input:
Problem: if x : y = 3 : 5 , find the value of ( 2 x + 4 y ) : ( 3 x – y ) 
Options: a ) 13 : 2 , b ) 11 : 2 , c ) 13 : 3 , d ) 13 : 4 , e ) 13 : 5

Ex Output:
a


Ex Input:
Problem: x and y are both integers . if x / y = 59.60 , then what is the sum of all the possible two digit remainders of x / y ? 
Options: a ) 560 , b ) 315 , c ) 672 , d ) 900 , e ) 1024

Ex Output:

b