You hear a loud noise behind you and look back over your left shoulder. Which of the following is true?
A. This was an ipsilateral contraction of your left sternocleidomastoid muscle.
B. This was a contralateral contraction of your left sternocleidomastoid muscle.
C. This was a contralateral contraction of your right sternocleidomastoid muscle.
D. This was an ipsilateral contraction of your right sternocleidomastoid muscle.
Answer: C
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