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 pipe can fill a cistern in 33 minutes . find the time in which 1 / 11 part of the cistern will be filled ? 
Options: a ) 5 min , b ) 2 min , c ) 3 min , d ) 1 min , e ) 10 min

Ex Output:
c


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 ) 255 , b ) 267 , c ) 235 , d ) 277 , e ) 211

Ex Output:
c


Ex Input:
Problem: the length of the bridge , which a train 170 meters long and travelling at 45 km / hr can cross in 30 seconds , is : 
Options: a ) 239 , b ) 277 , c ) 205 , d ) 88 , e ) 232

Ex Output:

c