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: Surgery
[{'content': 'Which of the following structure does not pass through Cavernous sinus: \nSelect and explain. \nA. Middle Cerebral aery, B. Internal Carotid aery, C. Abducens nerve, D. Trochlear nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Middle Cerebral aery (Ref: B.D. Chaurasia, 3rd Ed, Vol lll/Pg 72, 73) Relation of Cavernous sinus: A. Structures outside the sinus: (a) Superiorly: Optic tract, internal carotid aery, & anterior perforated substance (b) Inferiorly: Foramen lacerum & junction of greater wing of sphenoid (c) Medially: Hypophysis cerebri & sphenoid sinus (d) Laterally: Temporal lobe with uncus (e) Anteriorly: Superior orbital fissure & apex of the orbit (f) Posteriorly: Apex of petrous temporal bone & crus cerebri of midbrain B. Structures in the lateral wall of sinus: (a) Occulomotor nerve (b) Trochlear nerve (c) Ophthalmic nerve (d) Maxillary nerve (e) Trigeminal nerve C. Structures passing through the centre of sinus: (a) Internal carotid aery (b) Abducens nerve', 'role': 'assistant'}]