This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': "Enophthalmos is due to plasy of- \nSelect and explain. \nA. Levator palpebrae superioris, B. Superior tarsal muscle, C. Orbitalis muscle, D. Tenon's Capsule instability", 'role': 'user'}, {'content': "Answer: D \nExplanation: *Tenon's capsule instability is a major cause of enophthalmos, as it forms all the major ligament of the orbit which suppo the globe in the orbit. Ref: Duane's Clinical ophthalmology, vol.2, chapter 48, p.5", 'role': 'assistant'}]