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: in traveling from a dormitory to a certain city , a student went 1 / 5 of the way by foot , 2 / 3 of the way by bus , and the remaining 14 kilometers by car . what is the distance , in kilometers , from the dormitory to the city ? 
Options: a ) 30 , b ) 45 , c ) 60 , d ) 90 , e ) 105

Ex Output:
e


Ex Input:
Problem: a and b together can do a work in 4 days . if a alone can do it in 20 days . in how many days can b alone do it ? 
Options: a ) 11 , b ) 5 , c ) 6 , d ) 8 , e ) 25

Ex Output:
b


Ex Input:
Problem: a train running at the speed of 90 km / hr crosses a pole in 5 seconds . find the length of the train . 
Options: a ) 150 meter , b ) 145 meter , c ) 140 meter , d ) 125 meter , e ) none of these

Ex Output:

d