This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
A 21 year old woman presents to her physician with a swelling on her neck. On examination, she is diagnosed with an infection within the carotid sheath. Which of the following structures would be damaged? 
Select and explain. 
A. Vagus nerve and middle cervical ganglion, B. Internal carotid aery and recurrent laryngeal nerve, C. Internal jugular vein and vagus nerve, D. Sympathetic trunk and common carotid aery
C: Internal jugular vein and vagus nerve
Answer: C: Internal jugular vein and vagus nerve 
Explanation: Carotid sheath Anterior layer derived from pre tracheal layer Posterior layer - pre veebral layer CHOICE EXPLANATION & ELIMINATION REASON 1 Not correct 2 Not correct 3 Content of carotid sheath 4 Not correct