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': 'Endolymphatic duct connects which structure - \nSelect and explain. \nA. Scala media to subdural space, B. Scala vestibuli to aqueduct of cochlea, C. Scala tympani to aqueduct of cochlea, D. Scala tympani to subdural space', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endolymphatic duct – It is a part of membranous labyrinth (Scala media)\n\nIt is formed by union of saccule and utricle\nIt connects scala media to subdural space\nIts terminal part is dilated to form the endolymphatic sac\nEndolymphatic sac lies between the two layers of dura on the posterior surface of petrous bone\nSurgical importance – Endolymphatic sac is exposed for drainage or shunt operation in Meniere’s disease\n\nALSO KNOW\n\nDuctus reuniens – connects cochlear duct to saccule\nAqueduct of cochlea – connects scala tympani to subarachnoid space', 'role': 'assistant'}]