Correct

话头

/ huàtóu / 
Strokes

Definition

subject (under discussion)/thread (of an argument)

Example

As a Noun

thread of discourse

1
Jiǎnghuà
讲话
shí
时
duàn
断
le
了
huàtóu
话头

lose the thread of one's discourse

2
Jiēzhāo
接着
huàtóu
话头

take up the thread of a conversation

3
Dǎduàn
打断
huàtóu
话头

interrupt sb; cut sb short