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: the perimeter of a semi circle is 122 cm then the radius is ?
Options: a ) 17 , b ) 28 , c ) 24 , d ) 11 , e ) 12

Ex Output:
c

Ex Input:
Problem: if 8 people take an hour to complete a piece of work , then how long should 16 people will take to complete the same piece of work ?
Options: a ) 15 min , b ) 30 min , c ) 26 min , d ) 28 min , e ) 18 min

Ex Output:
b

Ex Input:
Problem: 24 people can write 48 book in 6 days working 8 hour a day . then in how many day 192 can be written by 50 people ?
Options: a ) 223 / 26 , b ) 288 / 27 , c ) 309 / 22 , d ) 288 / 26 , e ) 288 / 25

Ex Output:
e