This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of pituitary gland, Subject name: Medicine
[{'content': 'Which is the most common cranial nerve involved in pituitary apoplexy? \nSelect and explain. \nA. Optic nerve, B. Oculomotor nerve, C. Abducens, D. Facial nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pituitary Apoplexy: Hemorrhagic infarction of large pituitary adenomas or pituitary infarction consequent to traumatic major blood loss Ocular paresis in pituitary apoplexy results from compression of the cavernous sinus, which makes cranial nerves III, IV, and VI vulnerable to compression. Most common cranial nerve involved in pituitary apoplexy is: Occulomotor nerve', 'role': 'assistant'}]