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 action of extra-ocular muscle is spared in involvement of Occulomotor nerve - \nSelect and explain. \nA. Abduction, B. Depression, C. Elevation, D. Adduction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In third nerve palsy, out of three abductors two are spared, i.e., lateral rectus and superior ablique. Therfore, abduction is best preserved in 3rd nerve palsy.\nSome, intorsion & depression is also maintained. But the best answer here is abduction.', 'role': 'assistant'}]