This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Main action of superior rectus \nSelect and explain. \nA. Extorsion, B. Intorsion, C. Elevation, D. Depression', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Actions of superior rectus Veical axis: elevation Main action horizontal axis: addicts Anterioposterior axis: rotates medially (intorsion) Ref: BDC volume 3:sixth edition pg 211', 'role': 'assistant'}]