Correct
引子
/ yǐnzi /
Strokes
Definition
introduction/primer/opening words
Example
As a Noun
first song in Southern Song（南曲）and Northern Song（北曲）
As a Noun
actor's opening lines
As a Noun
introductory music; prelude
As a Noun
introductory remarks; introduction; lead-in
As a Noun
added ingredient (to a dose of herbal medicine to enhance its efficacy)