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': 'Primary action of superior oblique is \nSelect and explain. \nA. Intorsion, B. Depression, C. Adduction, D. Abduction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: actions of superior oblique: veical axis: depresses main action horizontal axis: abducts anteroposterior axis:rotates medically( intorsion) Ref.BDC volume 3:sixth edition pg 211', 'role': 'assistant'}]