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: the area of a triangle is with base 10 m and height 5 m ? 
Options: a ) 11 , b ) 25 , c ) 787 , d ) 122 , e ) 12

Ex Output:
b


Ex Input:
Problem: the volume of the sphere qq is ( dfrac { 37 } { 64 } % ) less than the volume of sphere pp and the volume of sphere rr is ( dfrac { 19 } { 27 } % ) less than that of sphere qq . by what is the surface areaof sphere rr less than the surfacearea of sphere pp ? 
Options: ['a ) 50 %', 'b ) 60 %', 'c ) 75 %', 'd ) 80 %', 'e ) 89 %']

Ex Output:
c


Ex Input:
Problem: if a rectangle have length 16 cm and diagonal 20 cm . calculate its area . 
Options: ['a ) 185', 'b ) 132', 'c ) 165', 'd ) 192', 'e ) 212']

Ex Output:

d