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: a number when divided by 6 leaves a remainder 3 . when the square of the same number is divided by 6 , the remainder is
Options: a ) 0 , b ) 1 , c ) 2 , d ) 3 , e ) 4

Ex Output:
d

Ex Input:
Problem: what is the area of an equilateral triangle whose one side length is 50 ?
Options: a ) 225 3 , b ) 325 3 , c ) 425 3 , d ) 525 3 , e ) 625 3

Ex Output:
e

Ex Input:
Problem: george ' s car calls for 8 ounces of oil for each cylinder used . his car ' s engine has 6 cylinders . if 16 ounces of oil has already been put into the engine used , then how many additional ounces of oil are needed ?
Options: ['a ) 16', 'b ) 48', 'c ) 64', 'd ) 32', 'e ) 8']

Ex Output:
d