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'.

Example Input: Problem: a train 605 m long is running with a speed of 60 km / hr . in what time will it pass a man who is running at 6 km / hr in the direction opposite to that in which the train is going ? 
Options: a ) 81 , b ) 16 , c ) 33 , d ) 54 , e ) 12
Example Output: c

Example Input: Problem: if 36 men can do a piece of work in 25 hours , in how many hours will 12 men do it ? 
Options: a ) 22 , b ) 38 , c ) 60 , d ) 88 , e ) 75
Example Output: e

Example Input: Problem: two trains 200 m and 150 m long are running on parallel rails at the rate of 40 kmph and 46 kmph respectively . in how much time will they cross each other , if they are running in the same direction ? 
Options: a ) 72 sec , b ) 210 sec , c ) 192 sec , d ) 252 sec , e ) none
Example Output:
b