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: find the length of the longest pole that can be placed in an indoor stadium 24 m long , 18 m wide and 16 m high 
Options: a ) 31 , b ) 32 , c ) 33 , d ) 34 , e ) 35
Example Output: d

Example Input: Problem: what is the least number of square tiles required to pave the floor of a room 11 m 50 cm long and 1 m 50 cm broad ? 
Options: a ) 724 , b ) 804 , c ) 69 , d ) 844 , e ) none
Example Output: c

Example Input: Problem: a train 125 m long passes a man , running at 5 km / hr in the same direction in which the train is going , in 15 seconds . the speed of the train is ? 
Options: a ) 35 , b ) 50 , c ) 88 , d ) 22 , e ) 12
Example Output:
a