What involuntary muscle causes hairs to stand on end?

Question: What involuntary muscle causes hairs to stand on end?

Options:

Stander
Arrector Pili
Frontalis
Levator

Correct answer:

Arrector Pili

Other mobile game answers:
Find the answers to emoji quiz answers, 600 celebs, guess the gif answers.
You can find other questions and answers of trivia crack at trivia crack cheats (other languages are also available, for this game).