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: a man can row his boat with the stream at 6 km / h and against the stream in 3 km / h . the man ' s rate is ? 
Options: a ) 1.5 kmph , b ) 3 kmph , c ) 8 kmph , d ) 7 kmph , e ) 5 kmph

Ex Output:
a


Ex Input:
Problem: an inspector rejects 15 % of the meters as defective . how many will he examine to reject 10 ? 
Options: a ) a ) 100 , b ) b ) 66.7 , c ) c ) 250 , d ) d ) 200 , e ) e ) 160

Ex Output:
b


Ex Input:
Problem: by investing rs . 1620 in 8 % stock , michael earns rs . 135 . the stock is then quoted at : 
Options: a ) rs . 80 , b ) rs . 96 , c ) rs . 106 , d ) rs . 108 , e ) rs . 118

Ex Output:

b