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: if s = x ^ 4 + y ^ 4 = 100 , then the greatest possible value of x is between 
Options: a ) 0 and 3 , b ) 3 and 6 , c ) 6 and 9 , d ) 9 and 12 , e ) 12 and 15
Example Output: b

Example Input: Problem: the difference between two numbers is 2395 . when the larger number is divided by the smaller one , the quotient is 6 and the remainder is 15 . the smaller number is 
Options: a ) 120 , b ) 239 , c ) 476 , d ) 523 , e ) 526
Example Output: c

Example Input: Problem: ram get 450 marks in his exam which is 90 % of total marks . what is the total marks ? 
Options: a ) 475 , b ) 600 , c ) 550 , d ) 500 , e ) 525
Example Output:
d