This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Cavity, Subject name: Anatomy
[{'content': 'Cavernous sinus contains: \nSelect and explain. \nA. Internal carotid artery, B. Anterior cerebral artery, C. Middle cerebral artery, D. Ophthalmic artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Internal carotid artery)Ref: Chaurasia, 3rd edi., Vol-3 Pg.73Structures passing through the centre of the cavernous sinus.* Internal carotid artery* Abducent nerveFig: Cavernous sinusStructures in the lateral wall of the sinus* Oculomotor nerve* Trochlear nerve* Ophthalmic nerve* Maxillary nerve* Trigeminal ganglionThese structures are separated from blood by endothelial lining of the sinus.', 'role': 'assistant'}]