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 rectangular plot measuring 10 meters by 50 meters is to be enclosed by wire fencing . if the poles of the fence are kept 5 meters apart . how many poles will be needed ? 
Options: a ) 46 m , b ) 66 m , c ) 26 m , d ) 24 m , e ) 25 m
Example Output: d

Example Input: Problem: if 4 spiders make 3 webs in 9 days , then how many days are needed for 1 spider to make 1 web ? 
Options: a ) 9 , b ) 12 , c ) 27 , d ) 24 , e ) 16
Example Output: b

Example Input: Problem: a train 200 m long crosses a platform 200 m long in 40 sec ; find the speed of the train ? 
Options: a ) 94 kmph , b ) 58 kmph , c ) 54 kmph , d ) 94 kmph , e ) 36 kmph
Example Output:
e