This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Motility, Subject name: Ophthalmology
[{'content': 'In dextroversion yoke muscle of right lateral rectus: \nSelect and explain. \nA. Left medial rectus, B. Right superior oblique, C. Left lateral rectus, D. Right medial rectus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Left medial rectusRef: Kanskis Clinical Ophthalmology 8th Ed; Page No-732-33Yoke muscles (Contralateral synergists) are pair of muscles (one from each eye) which contract simultaneously during version movements.For example right lateral rectus and left medial rectus acts as yoke muscle for dextroversion movement.Others pairs of yoke muscles are:Right SR and left IO: DextroelevationRight IR and left SO: Dextro depressionRight IO and left SR: LevoelevationRight SO and left IR : Levodepression', 'role': 'assistant'}]