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'.

Ex Input:
Problem: the average of first three prime numbers greater than 5 is ? 
Options: a ) 12.6 , b ) 12.9 , c ) 22.3 , d ) 10.3 , e ) 12.7

Ex Output:
d


Ex Input:
Problem: the mean of 40 observations was 100 . it was found later that an observation 50 was wrongly taken as 75 the corrected new mean is 
Options: a ) 125.8 , b ) 102.8 , c ) 99.375 , d ) 100.52 , e ) 122

Ex Output:
c


Ex Input:
Problem: if 204 ÷ 12.75 = 16 , then 2.04 ÷ 1.275 = ? 
Options: a ) 16 , b ) 1.6 , c ) 0.16 , d ) 0.016 , e ) none of these

Ex Output:

b