In this task, you need to provide the correct option for a given problem from the provided options.

Ex Input:
Problem: what is log 3 ( 4 ) log 4 ( 5 ) . . . log 80 ( 81 ) ? 
Options: a ) 1 , b ) 4 , c ) 81 , d ) log 80 243 , e ) e 81

Ex Output:
b


Ex Input:
Problem: divide $ 2000 among b , c in the ratio 4 : 16 . how many $ that c get ? 
Options: a ) $ 1200 , b ) $ 1400 , c ) $ 1600 , d ) $ 1800 , e ) $ 2000

Ex Output:
c


Ex Input:
Problem: 200 pupil total , out of 125 like pizza , 115 like burger , then how many like both ? 
Options: a ) 40 , b ) 50 , c ) 60 , d ) 70 , e ) 80

Ex Output:

a