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: it has been raining at the rate of 5 centimeters per hour . if the rain filled a cylindrical drum with a depth of 15 centimeters , and area 300 square centimeters , how long did it take to fill the drum completely ?
Options: ['a ) 3 hours', 'b ) 4 hours 15 minutes', 'c ) 6 hours', 'd ) 2 hours 5 minutes', 'e ) 8 hours']
Example Output: a

Example Input: Problem: the perimeter of one square is 24 m & that of another is 32 m . perimeter of a square whose area is equal to the sum of the areas of the 2 squares will be
Options: ['a ) 20 m', 'b ) 24 m', 'c ) 28 m', 'd ) 40 m', 'e ) 43 m']
Example Output: d

Example Input: Problem: the length of each side of an equilateral triangle having an area of 4 3 cm 2 is ?
Options: ['a ) 3 : 4', 'b ) 3 : 9', 'c ) 3 : 7', 'd ) 3 : 1', 'e ) 3 : 2']
Example Output:
a