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
Elevators of eye - 
Select and explain. 
A. SR and IO, B. IO and SO, C. IR and SO, D. SO and SR
A: SR and IO
Answer: A: SR and IO 
Explanation: Actions of extraocular muscles : Muscle Primary Secondary Teiary action action action LR Abduction -- -- SR Elevation Intorsion Adduction IR Depression Extorsion Adduction SO Intorsion Depression Abduction IO Extorsion Elevation Abduction Ref;A.K.Khurana ; 6th edition; Page no:339