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 structure can be felt at the lower pa of the medial border of sternocleidomastoid: 
Select and explain. 
A. Subclan aery, B. Common carotid aery, C. Internal mammary aery, D. Maxillary aery
B: Common carotid aery
Answer: B: Common carotid aery 
Explanation: B. i.e. Common carotid aery