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 360 kmph , crosses a pole in 5 sec , then the length of train is ?
Options: a ) 381 m , b ) 112 m , c ) 500 m , d ) 125 m , e ) 433 m

Ex Output:
c

Ex Input:
Problem: the figure above shows the dimensions of a semicircular cross section of a one - way tunnel . the single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel . if vehicles must clear the top of the tunnel by at least foot when they are inside the traffic lane , what should be the limit l on the height of vehicles that are allowed to use the tunnel ?
Options: a ) 5 ft , b ) 7 ft , c ) 8 ft , d ) 9 ft , e ) 10 ft

Ex Output:
b

Ex Input:
Problem: a person can swim in still water at 16 km / h . if the speed of water 8 km / h , how many hours will the man take to swim back against the current for 12 km ?
Options: a ) 3 , b ) 1.5 , c ) 2.3 , d ) 1.8 , e ) 6

Ex Output:
b