In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: an isosceles triangle with sides 13 13 10 and there is a circle inscribed it . find the radius of circle ?
Options: ['a ) 1.32', 'b ) 3.33', 'c ) 3.58', 'd ) 4.34', 'e ) 5.18']
Example Output: b

Example Input: Problem: the length of a rectangular plot is thrice its breadth . if the area of the rectangular plot is 867 sq m , then what is the breadth of the rectangular plot ?
Options: ['a ) 19 m', 'b ) 17 m', 'c ) 10 m', 'd ) 12 m', 'e ) 18 m']
Example Output: b

Example Input: Problem: the area of a triangle is with base 10 m and height 10 m ?
Options: a ) 11 , b ) 10 , c ) 50 , d ) 122 , e ) 12
Example Output:
c