This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem lesions and blood supply of CNS, Subject name: Anatomy
[{'content': '35-year-old woman presents to OPD with complains of headache after hitting her head accidentally with the wall while doing household chores . An MRI was ordered which confirmed presence of blood clot in the great cerebral vein of Galen. Obstructed vein is a direct tributary of which of the following venous structures? \nSelect and explain. \nA. Emissary veins, B. Pterygoid venous plexus, C. Diploic veins, D. Dural venous sinuses', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Veins of the brain are direct tributaries of dural venous sinuses. Emissary veins connect dural venous sinuses with the veins of scalp; Pterygoid venous plexus communicates with cavernous sinus through an emissary vein; Diploic veins lie in channels in the diploe of skull and communicate with dural sinuses, veins of scalp, and meningeal veins.', 'role': 'assistant'}]