This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Strabismus, Subject name: Ophthalmology
[{'content': 'Which one of the following extraocular muscles is served by a contra lateral brainstem subnucleus? \nSelect and explain. \nA. Superior rectus, B. Medial rectus, C. Inferior oblique, D. Inferior rectus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Superior rectusRef: Parson's, 22/e, p. 408Innervation of superior rectus is contralateral, rest all recti have ipsilateral innervation.", 'role': 'assistant'}]