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': "Most common extraocular muscle involved in Grave's disease \nSelect and explain. \nA. Superior rectus, B. Inferior rectus, C. Medial rectus, D. Superior oblique", 'role': 'user'}, {'content': 'Answer: B \nExplanation: IR > MR > SR > LR > obliques.', 'role': 'assistant'}]