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 rectangular block 10 cm by 20 cm by 30 cm is cut into an exact number of equal cubes . find the least possible number of cubes ? 
Options: a ) 6 , b ) 10 , c ) 15 , d ) 40 , e ) 22

Ex Output:
a


Ex Input:
Problem: if the length of the side of a square is doubled , what is the ratio of the areas of the original square to the area of the new square ? 
Options: ['a ) 1 : 4', 'b ) 2 : 4', 'c ) 3 : 4', 'd ) 4 : 4', 'e ) 5 : 4']

Ex Output:
a


Ex Input:
Problem: there is a square of side 6 cm . a circle is inscribed inside the square . find the ratio of the area of circle to square . 
Options: ['a ) 11 / 14', 'b ) 1 / 14', 'c ) 13 / 14', 'd ) 12 / 14', 'e ) 5 / 14']

Ex Output:

a