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: 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

Ex Output:
d


Ex Input:
Problem: working alone , pump a can empty a pool in 6 hours . working alone , pump b can empty the same pool in 9 hours . working together , how many minutes will it take pump a and pump b to empty the pool ? 
Options: a ) 192 , b ) 200 , c ) 208 , d ) 216 , e ) 224

Ex Output:
d


Ex Input:
Problem: a 1200 m long train crosses a tree in 120 sec , how much time will i take to pass a platform 900 m long ? 
Options: a ) 200 sec , b ) 210 sec , c ) 167 sec , d ) 197 sec , e ) 179 sec

Ex Output:

b