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: what is the area of a square field whose diagonal of length 16 m ? 
Options: a ) 128 , b ) 289 , c ) 200 , d ) 112 , e ) 178
Example Output: a

Example Input: Problem: the parameter of a square is equal to the perimeter of a rectangle of length 7.5 cm and breadth 6.5 cm . find the circumference of a semicircle whose diameter is equal to the side of the square . ( round off your answer to two decimal places ) ? 
Options: a ) 10.2 , b ) 10.27 , c ) 10.23 , d ) 10.21 , e ) 10.25
Example Output: d

Example Input: Problem: how can a cake ( circular ) be cut into 8 pieces by making just 3 cuts ? 
Options: ['a ) 21', 'b ) 787', 'c ) 37', 'd ) 26', 'e ) 01']
Example Output:
a