Bite my head off

[Julie]

Test No. incompl/inter-23 "Leave me alone", question 3

Alan: Well, I only asked - there's no need to bite my ......... off!

(a) nose
(b) head
(c) arm
(d) leg

Test No. incompl/inter-23 "Leave me alone", answer 3

Alan: Well, I only asked - there's no need to bite my head off!

Correct answer: (b) head
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I don't understand this question. Why body parts?

[Alan]

This is an idiom that means be very angry with someone.
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English as a Second Language
You can read my ESL story Womens' Day