question: trainer:trainee
choices.label: A B C D
choices.text: singer:sing doctor:patient lawyer:court writer:reader
explanation: the "trainer" can train the "trainee". "singers" will "sing". the "doctor" can treat the "patient". a "court" is where a "lawyer" defends. a "reader" can read a book written by a "writer".
relation: trainer trainee R4.4
relation: singer sing R4.1
relation: doctor patient R4.4
relation: reader writer R3.10