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: how many squares are there between 2011 to 2300 ? ? ? ? 
Options: ['a ) 3', 'b ) 4', 'c ) 5', 'd ) 6', 'e ) 7']

Ex Output:
a


Ex Input:
Problem: the perimeter of a rectangle is 60 mete ( 132 ) 7 × ( 132 ) ? = ( 132 ) 11.5 . 
Options: a ) 3 , b ) 3.5 , c ) 4 , d ) 4.5 , e ) 5

Ex Output:
d


Ex Input:
Problem: triangle atriangle b are similar triangles with areas 1536 units square and 1734 units square respectively . the ratio of there corresponding height would be 
Options: a ) 9 : 10 , b ) 17 : 19 , c ) 23 : 27 , d ) 16 : 17 , e ) 15 : 23

Ex Output:

d