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: the sides of a rectangle are in the ratio of 6 : 5 and its area is 1331 sq . m . find the perimeter of rectangle . 
Options: a ) 121 , b ) 123 , c ) 125 , d ) 122 , e ) 126
Example Output: a

Example Input: Problem: what is the ratio between perimeters of two squares one having 5 times the diagonal then the other ? 
Options: a ) 5 : 1 , b ) 3 : 1 , c ) 5 : 8 , d ) 3 : 2 , e ) 8 : 3
Example Output: a

Example Input: Problem: the radius of a cylinder is 6 m , height 21 m . the total surface area of the cylinder is ? 
Options: a ) 525 , b ) 528 , c ) 522 , d ) 529 , e ) 521
Example Output:
b