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'.

Input: Consider Input: Problem: the greatest number which on dividing 1657 and 2037 leaves remainders 10 and 7 respectively , is : 
Options: a ) 123 , b ) 1 , c ) 235 , d ) 305 , e ) 505

Output: b


Input: Consider Input: Problem: if 25 % of x is 30 less than 20 % of 1000 , then x is ? 
Options: a ) 188 , b ) 216 , c ) 156 , d ) 680 , e ) 121

Output: d


Input: Consider Input: Problem: 2 , 5 , 10 , 17 , . . 
Options: a ) 5 , b ) 8 , c ) 26 , d ) 7 , e ) 12


Output: c