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: 123 : 36 : : 221 : ? 
Options: a ) 52 , b ) 69 , c ) 72 , d ) 25 , e ) 32

Output: d


Input: Consider Input: Problem: find the average of first 4 multiples of 15 ? 
Options: a ) 10 , b ) 12.6 , c ) 22.5 , d ) 31.3 , e ) 37.5

Output: e


Input: Consider Input: Problem: what is the value of n if the sum of the consecutive odd integers from 1 to n equals 169 ? 
Options: a ) 47 , b ) 25 , c ) 37 , d ) 33 , e ) 29


Output: b