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: 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 fill pipe can fill 2 / 3 of cistern in 40 minutes in how many minutes , it can fill full of the cistern ?
Options: a ) 60 min , b ) 36 min , c ) 25 min , d ) 30 min , e ) 50 min

Ex Output:
a

Ex Input:
Problem: in a kilometer race , a beats b by 80 meters or 8 seconds . what time does a take to complete the race ?
Options: a ) 77 sec , b ) 92 sec , c ) 67 sec , d ) 16 sec , e ) 76 sec

Ex Output:
b