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
[{'content': 'Cavernous sinus does not communicate with the: \nSelect and explain. \nA. Internal jugular vein., B. External jugular vein., C. Opthalmic vein., D. Pterygoid plexus.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]