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
Cavernous sinus does not communicate with the: 
Select and explain. 
A. Internal jugular vein., B. External jugular vein., C. Opthalmic vein., D. Pterygoid plexus.
B: External jugular vein.
Answer: B: External jugular vein. 
Explanation: None