This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
Action of right superior oblique muscle is- 
Select and explain. 
A. Dextro depression, B. Dextro elevation, C. Levo elevation, D. Levo depression
D: Levo depression
Answer: D: Levo depression 
Explanation: Levodepression is movement to the left and downside. It is caused by simultaneous action of left inferior rectus and right superior oblique muscle Dextroelevation: Right superior rectus and left inferior oblique Levoelevation: Left superior rectus and right Inferior oblique Dextroversion: Right lateral rectus and left medial rectus Levoversion: Left lateral rectus and right medial rectus Dextrodepression: Right inferior rectus and left superior oblique Ref; A K Khurana ; 6 th edition ; Page no: 339