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 circular rim a having a diameter of 45 inches is rotating at the rate of x inches / min . another circular rim b with a diameter of 30 inches is rotating at the rate of y inches / min . what is the value of y in terms of x , if both the rims reach their starting positions at the same time after every rotation . 
Options: ['a ) 3 x / 2', 'b ) 4 x / 5', 'c ) 7 x / 5', 'd ) 5 x / 7', 'e ) 3 x / 4']

Ex Output:
a


Ex Input:
Problem: the volume of the largest right circular cone that can be cut out of a cube of edge 7 cm is : 
Options: ['a ) 89.8 cm ³', 'b ) 92.5 cm ³', 'c ) 132.8 cm ³', 'd ) 144.5 cm ³', 'e ) none']

Ex Output:
a


Ex Input:
Problem: the percentage increase in the area of a rectangle , if each of its sides is increased by 20 % is ? 
Options: a ) 44 % , b ) 45 % , c ) 50 % , d ) 55 % , e ) 60 %

Ex Output:

a