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: express 35 mps in kmph ?
Options: a ) 122 , b ) 188 , c ) 126 , d ) 140 , e ) 124

Ex Output:
c

Ex Input:
Problem: find the length of the longest pole that can be placed in an indoor stadium 24 m long , 18 m wide and 16 m high
Options: a ) 31 , b ) 32 , c ) 33 , d ) 34 , e ) 35

Ex Output:
d

Ex Input:
Problem: a train is running at a speed of 4040 km / hr and it crosses a post in 1818 seconds . what is the length of the train ?
Options: a ) 190 metres , b ) 160 metres , c ) 200 metres , d ) 120 metres , e ) 150 metres

Ex Output:
c