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
Structures lying deep to posterior belly of digastric are all except - 
Select and explain. 
A. Retromandibular vein, B. Hypoglossal nerve, C. Hyoglossus muscle, D. Occipital artery
A: Retromandibular vein
Answer: A: Retromandibular vein 
Explanation: None