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
Upper Lid Retractors include? 
Select and explain. 
A. Muller muscle and superior rectus, B. Levator palpabrae superioris and superior oblique, C. Superior oblique and superior rectus, D. Levator palpebrae superioris & muller muscle
D: Levator palpebrae superioris & muller muscle
Answer: D: Levator palpebrae superioris & muller muscle 
Explanation: *The levator palpebrae superioris is the impoant upper eye lid retractor. Injury or weakness to this muscle leads to ptosis. *Deep pa of the elevator muscle is the Muller's muscle, which is sympathetically innveed. Ref: Textbook of Ophthalmic reconstructive surgeries p.786