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: ENT
[{'content': 'Complication of trauma to danger area of the face \nSelect and explain. \nA. Visual loss, B. Meningitis, C. Cavernous sinus infection, D. Loss of memory', 'role': 'user'}, {'content': "Answer: C \nExplanation: The area of the upper lip and the low rent part of the nose is the danger area of the face. It is due to that this area is the common site of infection.\nThis area is drained by a facial vein which communicates with the cavernous sinus through the superior ophthalmic vein and pterygoid venous plexus through the emissary's vein,\nIn case of any infection of this area, it may spread to the cavernous sinus causing infection and/or thrombosis.", 'role': 'assistant'}]