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: how long does a train 110 m long running at the speed of 72 km / hr takes to cross a bridge 112 m length ? 
Options: a ) 82.1 sec , b ) 12.1 sec , c ) 16.1 sec , d ) 11.1 sec , e ) 12.15 sec

Ex Output:
d


Ex Input:
Problem: a man ' s regular pay is $ 3 per hour up to 40 hours . overtime is twice the payment for regular time . if he was paid $ 180 , how many hours overtime did he work ? 
Options: a ) 8 , b ) 5 , c ) 9 , d ) 6 , e ) 10

Ex Output:
e


Ex Input:
Problem: a train speeds past a pole in 11 seconds and a platform 120 m long in 22 seconds . its length is ? 
Options: a ) 128 , b ) 177 , c ) 199 , d ) 120 , e ) 150

Ex Output:

d