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: a 1.5 by 2 rectangle is inscribed in circle . what is the circumference of the circle ? 
Options: ['a ) 2.5 π', 'b ) 3 π', 'c ) 3.5 π', 'd ) 4 π', 'e ) 5.5 π']

Ex Output:
a


Ex Input:
Problem: if the area of a triangle with base 6 cm is equal to the area of a square with side 6 cm , then the altitude of the triangle is 
Options: ['a ) 12 cm', 'b ) 10 cm', 'c ) 11 cm', 'd ) 15 cm', 'e ) 20 cm']

Ex Output:
a


Ex Input:
Problem: the length of a rectangle is two - fifths of the radius of a circle . the radius of the circle is equal to the side of the square , whose area is 1225 sq . units . what is the area ( in sq . units ) of the rectangle if the rectangle if the breadth is 10 units ? 
Options: ['a ) 140 sq . units', 'b ) 158 sq . units', 'c ) 187 sq . units', 'd ) 607 sq . units', 'e ) 815 sq . units']

Ex Output:

a