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 product of a and b is equal to 12 more than twice the sum of a and b . if b = 10 , what is the value of b - a ? 
Options: a ) 2 , b ) 5 , c ) 7 , d ) 6 , e ) 35
Example Output: d

Example Input: Problem: 120 + 520 ÷ 5.00 = ? 
Options: a ) 100 , b ) 150 , c ) 120 , d ) 520 , e ) none
Example Output: e

Example Input: Problem: what least number must be subtracted from 12702 to get number exactly 99 ? 
Options: a ) 49 , b ) 30 , c ) 29 , d ) 31 , e ) 32
Example Output:
b