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: Anatomy
[{'content': 'Main function of superior oblique is: \nSelect and explain. \nA. Adduction, B. Elevation, C. Extoion, D. Intorsion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Superior oblique muscle/obliquus oculi superiorIt is a fusiform muscle originating in the upper, medial side of the orbit which abducts, depresses and internally rotates the eye.It is the only extraocular muscle innervated by the trochlear nerve (the fouh cranial nerve).', 'role': 'assistant'}]