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: danny is sitting on a rectangular box . the area of the front face of the box is half the area of the top face , and the area of the top face is 1.5 times the area of the side face . if the volume of the box is 1536 , what is the area of the side face of the box ? 
Options: a ) 34 , b ) 65 , c ) 88 , d ) 90 , e ) 128

Ex Output:
e


Ex Input:
Problem: if the sum of a number and its square is 240 , what is the number ? 
Options: a ) 15 , b ) 77 , c ) 25 , d ) 87 , e ) 171

Ex Output:
a


Ex Input:
Problem: how many diagonals does a polygon with 15 sides have , if one of its vertices does not connect to any diagonal ? 
Options: ['a ) 80', 'b ) 90', 'c ) 77', 'd ) 88', 'e ) 99']

Ex Output:

c