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
[{'content': 'Action of right superior oblique muscle is: \nSelect and explain. \nA. Dextrodepression, B. Dextroelevation, C. Laevoelevation, D. Laevodepression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Dextrodepression', 'role': 'assistant'}]