This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Chasaignac tubercle is 
Select and explain. 
A. Erbs point, B. Carotid tubercle on C6 veebra, C. Found on 1st rib, D. Medial condyle of humerus
B: Carotid tubercle on C6 veebra
Answer: B: Carotid tubercle on C6 veebra 
Explanation: The anterior tubercle of the sixth cervical veebra is known as the carotid tubercle or Chassaignac tubercle. This separates the carotid aery from the veebral aery and the carotid aery can be massaged against this tubercle to relieve the symptoms of supraventicular tachycardia . The carotid tubercle is also used as a landmark for anasthesia of the brachial plexus and cervical plexus . Ref - pubmed.com