What's the knee-jerk reaction?

[Xavierka]

English Language Tests, Intermediate level

ESL/EFL Test #382 "English Slang Idioms (113)", question 10

"I am sorry that I punched you in the face when you walked through the door last night, Bill. It was just a knee-jerk .......... I wasn't expecting you you said you were going to be out of town. I heard the knob rattle at 12 o'clock at night. I went to check it out, the door opened, and I swung. I thought you were a burglar," Matt said.

(a) reaction
(b) match
(c) dilemma
(d) defense

English Language Tests, Intermediate level

ESL/EFL Test #382 "English Slang Idioms (113)", answer 10

"I am sorry that I punched you in the face when you walked through the door last night, Bill. It was just a knee-jerk reaction. I wasn't expecting you you said you were going to be out of town. I heard the knob rattle at 12 o'clock at night. I went to check it out, the door opened, and I swung. I thought you were a burglar," Matt said.

Correct answer: (a) reaction

Your answer was: correct
_________________________

What's the knee-jerk reaction?

[Conchita]

You'll find a simple definition of the phrase here.

[Xavierka]

Gracias

[Conchita]

¡De nada!