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 180 m long is running with a speed of 55 km / hr . in what time will it pass a man who is running at 7 km / hr in the direction opposite to that in which the train is going ?
Options: a ) 5.5 , b ) 10.45 , c ) 7 , d ) 8 , e ) 9.5

Ex Output:
b

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: a train 320 m in length crosses a telegraph post in 12 seconds . the speed of the train is ?
Options: a ) 77 kmph , b ) 95 kmph , c ) 94 kmph , d ) 98 kmph , e ) 96 kmph

Ex Output:
e