In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: having scored 95 runs in the 19 th inning , a cricketer increases his average score by 4 . what will be his average score after 19 innings ? 
Options: a ) 28 , b ) 27 , c ) 23 , d ) 22 , e ) 24

Ex Output:
c


Ex Input:
Problem: how many positive integers less than 1000 are multiples of 5 but not of 4 or 7 ? 
Options: a ) 114 , b ) 121 , c ) 122 , d ) 129 , e ) 136

Ex Output:
c


Ex Input:
Problem: if a - b = 3 and a ( power 2 ) + b ( power 2 ) = 23 , find the value of ab . 
Options: a ) 5 , b ) 8 , c ) 7 , d ) 10 , e ) 3

Ex Output:

c