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': 'Ophthalmoplegia is: \nSelect and explain. \nA. Lack of eyeball movement, B. Lack of accommodation, C. Lack of blood supply to retina, D. Lack of vision', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ophthalmoplegia\n→ Lack of eyeball movement.\n→ Due to involvement of III, IV, V (Ophthalmic division), VI cranial nerve.\n→ VI cranial nerve is most commonly involved in ophthalmoplegia.', 'role': 'assistant'}]