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
Function of superior oblique muscle - 
Select and explain. 
A. Intortion, B. Extortion, C. Lateral rotation, D. Upward rotation
A: Intortion
Answer: A: Intortion 
Explanation: Superior oblique causes intorsion/medial rotation/ internal rotation; abduction and depression.
There no such movements in eye called upward rotation or downward rotation. Simply there is elevation and depression.