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: each of the integers from 0 to 9 , inclusive , is written on a separate slip of blank paper and the ten slips are dropped into a hat . if 5 of the slips are the drawn , without replacement , what is the probability that all 5 have a even number written on it ? 
Options: a ) 1 / 252 , b ) 1 / 10 , c ) 1 / 8 , d ) 1 / 2 , e ) 5 / 9

Ex Output:
a


Ex Input:
Problem: what sum of money will produce rs . 70 as simple interest in 4 years at 4 1 / 2 percent ? 
Options: a ) 263 , b ) 500 , c ) 388.9 , d ) 368 , e ) 339

Ex Output:
c


Ex Input:
Problem: a company has two types of machines , type r and type s . operating at a constant rate a machine of r does a certain job in 36 hours and a machine of type s does the job in 4 hours . if the company used the same number of each type of machine to do job in 12 hours , how many machine r were used ? 
Options: a ) 3 , b ) 4 , c ) 9 / 5 , d ) 9 / 8 , e ) 12

Ex Output:

c