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: Ophthalmology
[{'content': 'Which of these can cause 3\nrd\n nerve paralysis -a) Posterior communicating artery (PCA) aneurysmb) Tolosa - Hunt syndromec) Midbrain infarctd) Pons Infarcte) Lateral medullary lesion \nSelect and explain. \nA. abc, B. bc, C. acd, D. bcd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Causes of occulornotor nerve paralysis\n\nInfarct, haemorrhage, demyelination, infection, tumor.\nAneurysm ofposterior communicating artery & basilar artery.\nAneurysm, infarct, compression, tumor, meningitis.\nInternal carotid artery aneurysm, carotid-cavernous fistula, cavernous sinus thrombosis, tumors (pituitary adenoma, meningioma, metastasis), herpes zoster, Tolosa-hunt syndrome.\nInfarction of nerve e.g. diabetes, giant cell arteritis.', 'role': 'assistant'}]