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'.

Example Input: Problem: find the value of ( 55 + 113 / 78 ) × 78 
Options: a ) 4423 , b ) 4403 , c ) 4413 , d ) 2403 , e ) 4375
Example Output: b

Example Input: Problem: a , b and c rents a pasture for rs . 1073 . a put in 12 horses for 8 months , b 16 horses for 9 months and 18 horses for 6 months . how much should c pay ? 
Options: a ) 270 , b ) 289 , c ) 267 , d ) 255 , e ) 333
Example Output: e

Example Input: Problem: simplify : 250 x 250 - 100 x 100 
Options: a ) 761200 , b ) 761400 , c ) 52500 , d ) 761500 , e ) none of them
Example Output:
c