question: bus:conductor
choices.label: A B C D
choices.text: driver:train car:passenger airplane:stewardess salesperson:store
explanation: a "conductor" sells tickets on a "bus". a "driver" can work on a "train". the "car" is ridden by the "passenger", but the workplace of the "passenger" is not the "car". "stewardesses" work on "airplanes". a "salesperson" works in a "store".
relation: car passenger R3.10
relation: airplane stewardess R3.5