This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Sphenopareital sinus drains into? \nSelect and explain. \nA. Saggital sinus, B. Transverse sinus, C. Cavernous sinus, D. Internal juglar vein', 'role': 'user'}, {'content': "Answer: C \nExplanation: Sphenoparietal sinus and the frontal trunk of the middle meningeal vein may drain either into the pterygoid plexus through the foramen ovale or into the sphenoparietal or cavernous sinus. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.", 'role': 'assistant'}]