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: 5.005 / 4.004 = 
Options: a ) 1.05 , b ) 1.50015 , c ) 1.501 , d ) 1.5015 , e ) 1.25
Example Output: e

Example Input: Problem: for a certain exam , a score of 60 was 2 standard deviations below mean and a score of 100 was 3 standard deviations above mean . what was the mean score for the exam ? 
Options: a ) 74 , b ) 76 , c ) 78 , d ) 80 , e ) 82
Example Output: b

Example Input: Problem: 0.0005215 / 0.000305 x 6.2 = ? 
Options: a ) 10.6 , b ) 11.3 , c ) 12.7 , d ) 13.4 , e ) 14.5
Example Output:
a