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: 49 ã — 49 ã — 49 ã — 49 x 49 = 7 ? 
Options: a ) 4 , b ) 7 , c ) 8 , d ) 10 , e ) none of these

Output: d


Input: Consider Input: Problem: for how many integer values of n will the value of the expression 4 n + 7 be an integer greater than 1 and less than 100 ? 
Options: a ) 30 , b ) 28 , c ) 27 , d ) 25 , e ) 26

Output: d


Input: Consider Input: Problem: a man is 28 years older than his son . in two years , his age will be twice the age of his son . the present age of the son is ? 
Options: a ) 16 , b ) 19 , c ) 15 , d ) 26 , e ) 10


Output: d