In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: if radius of a circle is reduced by 10 % , then how much % of its area will be reduced ?
Options: ['a ) 10 %', 'b ) 19 %', 'c ) 20 %', 'd ) 36 %', 'e ) 30 %']
Example Output: b

Example Input: Problem: the sides of a square region , measured to the nearest centimeter , are 7 centimeters long . the least possible value of the actual area of the square region is
Options: ['a ) 42.25 sq cm', 'b ) 45.25 sq cm', 'c ) 43.25 sq cm', 'd ) 50.25 sq cm', 'e ) 52.25 sq cm']
Example Output: a

Example Input: Problem: what should be added to 5021 so that it may become a perfect square ?
Options: a ) 20 , b ) 23 , c ) 26 , d ) 27 , e ) 29
Example Output:
a