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: calculate the circumference of a circular field whose radius is 8 centimeters .
Options: a ) 17 cm , b ) 18 cm , c ) 1 cm , d ) 16 cm , e ) 6 cm

Ex Output:
d

Ex Input:
Problem: two consultants can type up a report in 12.5 hours and edit it in 7.5 hours . if mary needs 30 hours to type the report and jim needs 12 hours to edit it alone , how many r hours will it take if jim types the report and mary edits it immediately after he is done ?
Options: a ) 41.4 , b ) 34.1 , c ) 13.4 , d ) 12.4 , e ) 10.8

Ex Output:
a

Ex Input:
Problem: on a map , 3.5 inches represent 35 miles . how many miles approximately is the distance if you measured 127 centimeters assuming that 1 - inch is 2.54 centimeters ?
Options: a ) 515 , b ) 500 , c ) 525 , d ) 530 , e ) 535

Ex Output:
b