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: find the surface area of a 8 cm x 4 cm x 2 cm brick . 
Options: a ) 136 cu cm , b ) 112 cu cm , c ) 164 cu cm , d ) 180 cu cm , e ) none

Ex Output:
b


Ex Input:
Problem: 10 business executives and 7 chairmen meet at a conference . if each business executive shakes the hand of every other business executive and every chairman once , and each chairman shakes the hand of each of the business executives but not the other chairmen , how many handshakes would take place ? 
Options: a ) 144 , b ) 131 , c ) 115 , d ) 90 , e ) 45

Ex Output:
c


Ex Input:
Problem: there is a square with sides of 9 . what is the area of the biggest circle that can be cut out of this square ? 
Options: a ) 72.83 , b ) 63.62 , c ) 81 , d ) 254.47 , e ) 100

Ex Output:

b