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

Ex Input:
Problem: a square of 2 unit is given and four circles are made on its corners having equal radius of each . and another circle of equal radius is made on the center of the square . find out the area of square which is not covered by circles ? 
Options: ['a ) 0.76', 'b ) 0.86', 'c ) 0.96', 'd ) 1.16', 'e ) 1.26']

Ex Output:
b


Ex Input:
Problem: if the area of a circle decreases by 30 % , then the radius of a circle decreases by 
Options: a ) 20 % , b ) 16 % , c ) 36 % , d ) 64 % , e ) none of these

Ex Output:
b


Ex Input:
Problem: the least perfect square , which is divisible by each of 21 , 36 and 66 is 
Options: a ) 213414 , b ) 213424 , c ) 213434 , d ) 213444 , e ) none of these

Ex Output:

d