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: Surgery
[{'content': 'Cavernous sinus thrombosis following infection of anterior maxillary teeth most often from spread of infection along \nSelect and explain. \nA. Facial artery, B. Angular artery, C. Ophthalmic vein, D. Pterygoid plexus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]