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: what is the measure of the radius of the circle that circumscribes a triangle whose sides measure 11 , 60 and 61 ?
Options: a ) 6.5 , b ) 12.5 , c ) 28 , d ) 30.5 , e ) 40

Ex Output:
d

Ex Input:
Problem: approximately how many cubic feet of water are needed to fill a circular swimming pool that is 100 feet across and 4 feet deep ?
Options: a ) 15000 , b ) 30000 , c ) 50000 , d ) 70000 , e ) 90000

Ex Output:
b

Ex Input:
Problem: the diagonals of a rhombus are 18 cm and 22 cm . find its area ?
Options: ['a ) 277', 'b ) 266', 'c ) 198', 'd ) 288', 'e ) 212']

Ex Output:
c