In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: how long will a boy take to run round a square field of side 50 meters , if he runs at the rate of 10 km / hr ? 
Options: a ) 52 sec , b ) 45 sec , c ) 72 sec , d ) 25 sec , e ) 39 sec

Ex Output:
c


Ex Input:
Problem: a candidate got 35 % of the votes polled and he lost to his rival by 2430 votes . how many votes were cast ? 
Options: a ) 7500 , b ) 3388 , c ) 8100 , d ) 2888 , e ) 2661

Ex Output:
c


Ex Input:
Problem: 10 is subtracted from 50 % of a number , the result is 25 . find the number ? 
Options: a ) 75 , b ) 70 , c ) 35 , d ) 170 , e ) 50

Ex Output:

b