This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Strabismus, Subject name: Ophthalmology
[{'content': 'Lost muscle in squint surgery is \nSelect and explain. \nA. MR, B. LR, C. SR, D. SO', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) MRwww.cybersight.orgwww.eyewiki.aao.orgRef: , , Pubmed, PMID: 11705143)Lost or slipped muscle is usually MR. It is known as the Surgeon's Graveyard.", 'role': 'assistant'}]