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: if a train , travelling at a speed of 180 kmph , crosses a pole in 5 sec , then the length of train is ? 
Options: a ) 250 m , b ) 112 m , c ) 117 m , d ) 125 m , e ) 123 m

Ex Output:
a


Ex Input:
Problem: the sum of two consecutive integers is 61 . find the numbers . 
Options: a ) 17 , 18 , b ) 30,31 , c ) 5 , 6 , d ) 1 , 2 , e ) 8 , 9

Ex Output:
b


Ex Input:
Problem: a train running at the speed of 40 km / hr crosses a pole in 9 sec . what is the length of the train ? 
Options: a ) 100 m , b ) 150 m , c ) 187 m , d ) 167 m , e ) 197 m

Ex Output:

a