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 anterior triangle occupies the side of the neck in front of sternomastoid muscle. Each triangle presents boundaries in front: 
Select and explain. 
A. Anterior median line of the neck extending from symphysis menti to suprasternal notch., B. The midline of the neck, C. Midline of the neck up to the sternoclavicular joint, D. Posterior border of thyroid gland
A: Anterior median line of the neck extending from symphysis menti to suprasternal notch.
Answer: A: Anterior median line of the neck extending from symphysis menti to suprasternal notch. 
Explanation: Boundaries of anterior triangle are:
Anteriorly by the median plane.
Posteriorly by the sternocleidomastoid.
Superiorly by the base of the mandible and by a line joining the angle of
mandible to the mastoid process.
The apex of the triangle lies above the manubrium sterni