the teacher’s; belonging to the teacher, [honorific title]’s; of [a teacher, doctor, lawyer, etc.]
I couldn't help but laugh at the teacher's joke.
キング先生の診察の予約をしたいのですが。
I’d like to make an appointment to see Dr. King.
No, my husband became addicted because of the doctor’s prescription.
— 落下の解剖学 (2023)