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: the length of the longest tape in cm which can be used to measure exactly , the length 7 m ; 3 m 85 cm ; and 12 m 95 cm is : 
Options: a ) 37 , b ) 35 , c ) 34 , d ) 36 , e ) 38
Example Output: b

Example Input: Problem: a train 150 m long crosses a platform 130 m long in 20 sec ; find the speed of the train ? 
Options: a ) 50 , b ) 60 , c ) 55 , d ) 45 , e ) 53
Example Output: a

Example Input: Problem: a train 90 m long is running at 20 kmph . in how much time will it pass a platform 80 m long ? 
Options: a ) 15.6 seconds , b ) 24.6 seconds , c ) 28.6 seconds , d ) 13.6 seconds , e ) 35.6 seconds
Example Output:
d