question: traffic lights:traffic
choices.label: A B C D
choices.text: airport:security check cell phone:call ministry of education:students switch:current
explanation: "traffic" can be controlled by "traffic lights". passing the "security check" requires entering the "airport" first, rather than directly controlling the "security check". the "call" function can be displayed through the "cell phone", instead of directly controlling the "call". the department that manages and serves the "students" is the "ministry of education", instead of controlling the "students". "current" can be controlled by a "switch".
relation: traffic lights traffic R3.10
relation: switch current R3.10