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 persons differ by 20 years . if 6 year ago , the elder one be 3 times as old the younger one , find their present age 
Options: a ) 12,28 , b ) 14,30 , c ) 16,36 , d ) 18,34 , e ) 19,34

Ex Output:
c


Ex Input:
Problem: in goshawk - eurasian nature reserve 30 percent of the birds are hawks , and 40 percent of the non - hawks are paddyfield - warblers . if there are 25 percent as many kingfishers as paddyfield - warblers in the reserve , then what percent of the birds b in the nature reserve are not hawks , paddyfield - warblers , or kingfishers ? 
Options: a ) 25 % , b ) 35 % , c ) 45 % , d ) 70 % , e ) 80 %

Ex Output:
b


Ex Input:
Problem: 0 , 1 , 4 , 15 , 64 , ____ 
Options: a ) 225 , b ) 325 , c ) 125 , d ) 145 , e ) none

Ex Output:

b