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: the length of the bridge , which a train 140 metres long and travelling at 45 km / hr can cross in 30 seconds , is :
Options: a ) 200 m , b ) 235 m , c ) 245 m , d ) 250 m , e ) 270 m

Ex Output:
b

Ex Input:
Problem: a train running at the speed of 60 km / hr crosses a pole in 6 sec . what is the length of the train ?
Options: a ) 356 , b ) 278 , c ) 127 , d ) 100 , e ) 150

Ex Output:
d

Ex Input:
Problem: jerry travels 8 miles at an average speed of 40 miles per hour , stops for 15 minutes , and then travels another 20 miles at an average speed of 60 miles per hour . what is jerry ' s average speed , in miles per hour , for this trip ?
Options: a ) 35 , b ) 42.5 , c ) 44 , d ) 50 , e ) 52.5

Ex Output:
a