This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
The posterior triangle of the neck is bounded by the following Except 
Select and explain. 
A. Trapezius, B. Splenius cervicis, C. Sternocleidomastoid, D. Clavicle
B: Splenius cervicis
Answer: B: Splenius cervicis 
Explanation: Posterior Triangle
The posterior triangle is a space on the side of the neck situated behind the
sternocleidomastoid muscle.

Boundaries
Anterior: Posterior border of sternocleidomastoid

Posterior :Anterior border of trapezius

Inferior or base: Middle one- third of clavicle

Apex lies on the superior nuchal line where the trapezius And sternocleidomastoid meet

Roof : Investing layer

Floor: Formed by a prevertebral layer of deep cervical fascia covering
the following muscle: a. splenius capitisb. Levator scapulae; c.
Scalenus medius and occasionally scalenus posterior.