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: find the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 10 cm . 
Options: a ) 287 cm 2 , b ) 190 cm 2 , c ) 180 cm 2 , d ) 785 cm 2 , e ) 295 cm 2

Ex Output:
b


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: how long does a truck of 200 m long traveling at 60 kmph takes to cross a bridge of 180 m in length ? 
Options: a ) 36.7 , b ) 26.8 , c ) 22.8 , d ) 21.1 , e ) 16.2

Ex Output:

c