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': 'All are paired venous sinuses except \nSelect and explain. \nA. Superior petorsal, B. Inferior petorsal, C. Superior sagittal, D. Transverse', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PAIRED VENOUS SINUSES: 1.Cavernous sinus 2.Superior petrosal sinus 3.Inferior petrosal sinus 4.Transverse sinus 5.Sigmoid sinus 6.Sphenoparietal sinus 7.Petrosquamous sinus 8.Middle meningeal sinus NOTES: UNPAIRED VENOUS SINUSES: 1.Superior sagittal sinus 2.Inferior sagittal sinus 3.Straight sinus 4.Occipital sinus 5.Anterior intercavernous sinus 6.Posterior intercavernous sinus 7.Basilar plexus of veins Ref BDC volume 3,Sixth edition pg 193', 'role': 'assistant'}]