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 radius of a cylinder is 10 m , height 15 m . the volume of the cylinder is : 
Options: a ) 2200 , b ) 5500 , c ) 3300 , d ) 1100 , e ) 4714.3
Example Output: e

Example Input: Problem: the total surface area of a solid hemisphere of diameter 14 cm , is : 
Options: ['a ) 462 cm ²', 'b ) 530 cm ²', 'c ) 1345 cm ²', 'd ) 1788 cm ²', 'e ) none']
Example Output: a

Example Input: Problem: there is a square with sides of 12 . what is the circumference of the biggest circle that can be cut out of this square ? 
Options: ['a ) 75.4', 'b ) 31.42', 'c ) 36', 'd ) 18.85', 'e ) 37.7']
Example Output:
e