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
[{'content': 'Elevators of eye - \nSelect and explain. \nA. SR and IO, B. IO and SO, C. IR and SO, D. SO and SR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]