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
Which of the following is not a component of carotid sheath 
Select and explain. 
A. Vagus nerve, B. Internal jugular vein, C. External carotid artery, D. Internal carotid artery
C: External carotid artery
Answer: C: External carotid artery 
Explanation: It is a condensation of the fibroareolar tissue around the main vessels of the neck. There are the common and internal carotid arteries and internal jugular vein and the vagus nerve