This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen: Miscellaneous, Subject name: Anatomy
[{'content': 'Angular vein communicates with \nSelect and explain. \nA. Cavernous sinus, B. Superior sagittal sinus, C. Inferior sagittal sinus, D. Straight Sinus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angular Vein is the upper most segment of the Facial Vein, formed by the union of the Supratrochlear Vein and Supraorbital Vein. It runs obliquely downward by the side of the nose, is linked with the cavernous sinus by the superior and inferior ophthalmic veins which are devoid of valves. fig:-Angular vein communication with cavernous sinus', 'role': 'assistant'}]