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': 'Secondary action of Inferior oblique \nSelect and explain. \nA. Intortion, B. Extortion, C. Elevation, D. Depression', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Inferior oblique\n1o - Extortion\n2o - Elevation\n3o - Abduction.', 'role': 'assistant'}]