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 slant height of a cone is 22 cm and radius of the base is 7 cm , find the curved surface of the cone ?
Options: a ) 426 , b ) 284 , c ) 483 , d ) 256 , e ) 428
Example Output: c

Example Input: Problem: in the rectangular coordinate system , points ( 4 , 0 ) and ( 4 , 0 ) both lie on circle c . what is the maximum possible value of the radius of c
Options: a ) 2 , b ) 4 , c ) 8 , d ) 16 , e ) none of the above
Example Output: b

Example Input: Problem: smita was making a cube with dimensions 5 * 5 * 5 using 1 * 1 * 1 cubes . what is the number of cubes needed to make a hollow cube looking of the same shape ?
Options: ['a ) 98', 'b ) 104', 'c ) 100', 'd ) 61', 'e ) 51']
Example Output:
a