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: the side of a square is increased by 20 % then how much % does its area increases ? 
Options: a ) 44.00 % , b ) 45.25 % , c ) 48.75 % , d ) 50.00 % , e ) 40.00 %
Example Output: a

Example Input: Problem: when magnified 1,000 times by an electron microscope , the image of a certain circular piece of tissue has a diameter of 2 centimeter . the actual diameter of the tissue , in centimeters , is 
Options: ['a ) 0.005', 'b ) 0.002', 'c ) 0.001', 'd ) 0.0005', 'e ) 0.0002']
Example Output: b

Example Input: Problem: two cylinders of the radius in the ratio 3 : 5 and heights in the ratio 10 : 9 . then find the volumes ratio ? 
Options: ['a ) 4 : 5', 'b ) 1 : 5', 'c ) 3 : 5', 'd ) 1.5 : 5', 'e ) 2 : 5']
Example Output:
e