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': 'Function of superior oblique muscle - \nSelect and explain. \nA. Intortion, B. Extortion, C. Lateral rotation, D. Upward rotation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Superior oblique causes intorsion/medial rotation/ internal rotation; abduction and depression.\nThere no such movements in eye called upward rotation or downward rotation. Simply there is elevation and depression.', 'role': 'assistant'}]