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

Ex Input:
Problem: if 22 men do a work in 55 days , in how many days will 10 men do it ?
Options: a ) 121 , b ) 123 , c ) 119 , d ) 125 , e ) 127

Ex Output:
a

Ex Input:
Problem: a cube of side two meter length is cut into small cubes of side 10 cm each . how many such small cubes can be obtained ?
Options: a ) 2878 , b ) 2778 , c ) 1000 , d ) 8000 , e ) 8900

Ex Output:
d

Ex Input:
Problem: a circular wheel radius is 1.75 m . for covering 11 k . m how much time it revolve ?
Options: ['a ) 10', 'b ) 100', 'c ) 1000', 'd ) 10000', 'e ) 50']

Ex Output:
c