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 many liters of water must be evaporated from 50 liters of a 8 - percent sugar solution to get a 10 - percent solution ? 
Options: a ) 8 , b ) 10 , c ) 12 , d ) 14 , e ) 16

Ex Output:
b


Ex Input:
Problem: the calendar of the year 2060 can be used again in the year ? 
Options: a ) 2081 , b ) 2083 , c ) 2088 , d ) 1971 , e ) 1973

Ex Output:
c


Ex Input:
Problem: a trader sold an article on a certain price with 20 % profit . if he sold double of previous selling price then find its profit % 
Options: a ) 140 % , b ) 120 % , c ) 100 % , d ) 90 % , e ) 80 %

Ex Output:

a