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
[{'content': 'True regarding surface anatomy of internal jugular vein - \nSelect and explain. \nA. Line passing from ear lobule to mid point of clavicle, B. Line passing from ear lobule to medial end of clavicle, C. Line joining ear lobule to lateral end of clavicle, D. Line joining mastoid process to mid point of clavicle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: SURFACE MARKINGS OF IMPORTANT VESSELS OF NECK\nSurface anatomy of internal\xa0jugular vein:\n\nInternal jugular vein is marked by a line joining a point on the neck, medial to the ear lobule to a point at the medial end of the clavicle\n\nSurface anatomy of the external jugular vein:\n\nMarked by a line joining a point a little below and behind the angle of the mandible to a point on the clavicle just lateral to the posterior border of the sternocleidomastoid.\n\nCommon carotid artery:\n\nMarked by a line joining a point on the sternovlavicular joint to a point on the anterior border of the sternocleidomastoid at the level of upper border of the thyroid cartilage.\n\nInternal carotid artery:\n\nMarked by a line joining a point on the anterior border of the sternocleidomastoid at the level of upper border of thyroid cartilage to a point on the posterior border of the condyle of the mandible.\n\nExternal carotid artery:\n\nMarked by a line joining a point on the anterior border of the stemocleidomastoid at the level of upper border of thyroid cartilage to a point on the posterior border of the neck of the mandible.', 'role': 'assistant'}]