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: a van takes 6 hours to cover a distance of 180 km . how much should the speed in kmph be maintained to cover the same direction in 3 / 2 th of the previous time ? 
Options: a ) 50 kmph , b ) 60 kmph , c ) 70 kmph , d ) 80 kmph , e ) 20 kmph

Ex Output:
e


Ex Input:
Problem: the sector of a circle has radius of 21 cm and central angle 180 o . find its perimeter ? 
Options: a ) 91.5 , b ) 92 , c ) 108 , d ) 94 , e ) 95

Ex Output:
c


Ex Input:
Problem: a is twice as good a workman as b and they took 9 days together to do the work b alone can do it in . 
Options: a ) 17 days , b ) 12 days , c ) 29 days , d ) 25 days , e ) 27 days

Ex Output:

e