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
Function of superior oblique muscle is: 
Select and explain. 
A. Intorsion, adduction and depression, B. Intorsion, abduction and elevation, C. Intorsion, abduction and depression, D. Extorsion, abduction and depression
C: Intorsion, abduction and depression
Answer: C: Intorsion, abduction and depression 
Explanation: The primary action of the superior oblique muscle is intorsion (internal rotation), the secondary action is depression (primarily in the adducted position) and the teiary action is abduction.