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: we need to carve out 125 identical cubes from a cube . what is the minimum number of cuts needed ?
Options: ['a ) 8', 'b ) 9', 'c ) 10', 'd ) 11', 'e ) 12']

Ex Output:
e

Ex Input:
Problem: what is the area of square field whose side of length 20 m ?
Options: a ) 200 sq m , b ) 186 sq m , c ) 586 sq m , d ) 287 sq m , e ) 400 sq m

Ex Output:
e

Ex Input:
Problem: eight cubes , each with a volume of 512 cm ^ 3 , are joined to form one large cube . what is the surface area of the large cube ?
Options: ['a ) 4096 sq cm', 'b ) 1536 sq cm', 'c ) 1024 sq cm', 'd ) 2048 sq cm', 'e ) 512 sq cm']

Ex Output:
b