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
Primary action of inferior oblique ? 
Select and explain. 
A. Abduction, B. Adduction, C. Extorsion, D. Elevation
C: Extorsion
Answer: C: Extorsion 
Explanation: Ans. is 'c' i.e., Extorsion