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: the least number , which when divided by 12 , 31 , 20 and 54 leaves in each case a remainder of 8 is : 
Options: a ) 448 , b ) 488 , c ) 16748 , d ) 548 , e ) 560
Example Output: c

Example Input: Problem: each child has 2 pencils and 13 skittles . if there are 15 children , how many pencils are there in total ? 
Options: a ) 30 , b ) 12 , c ) 18 , d ) 22 , e ) 08
Example Output: a

Example Input: Problem: simplify : 81 x 81 + 68 x 68 - 2 x 81 x 68 . 
Options: a ) 169 , b ) 159 , c ) 189 , d ) 179 , e ) 219
Example Output:
a