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 car gets 40 kilometers per gallon of gasoline . how many gallons of gasoline would the car need to travel 210 kilometers ?
Options: a ) 8.25 gallons , b ) 7.5 gallons , c ) 6.55 gallons , d ) 5.25 gallons , e ) 4.5 gallons

Ex Output:
d

Ex Input:
Problem: a train passes a station platform in 60 sec and a man standing on the platform in 20 sec . if the speed of the train is 54 km / hr . what is the length of the platform ?
Options: a ) 615 m , b ) 420 m , c ) 168 m , d ) 197 m , e ) 691 m

Ex Output:
b

Ex Input:
Problem: find the cost of fencing around a circular field of diameter 42 m at the rate of rs . 5 a meter ?
Options: a ) 655.9 , b ) 659.75 , c ) 650.57 , d ) 655.9 , e ) 600.3

Ex Output:
b