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 train 1500 m long can cross an electric pole in 50 sec and then find the speed of the train ? 
Options: a ) 106 , b ) 107 , c ) 108 , d ) 109 , e ) 110

Ex Output:
c


Ex Input:
Problem: walking with 5 / 4 of my usual speed , i miss the bus by 5 minutes . what is my usual time ? 
Options: a ) 18 , b ) 19 , c ) 20 , d ) 22 , e ) 24

Ex Output:
c


Ex Input:
Problem: if 10 men can reap 120 acres of land in 15 days , how many acres of land can 20 men reap in 30 days ? 
Options: a ) 120 , b ) 240 , c ) 360 , d ) 1200 , e ) 480

Ex Output:

e