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': 'In case of Ptosis which cranial nerve will be completely paralyzed \nSelect and explain. \nA. 3rd CN palsy, B. 4th CN palsy, C. 5th CN palsy, D. 6th CN palsy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) 3rd CN palsyRef: A.K. Khurana 6th ed. /379* Ptosis is drooping of eyelid.* Eyelid is comprised of 4 muscles:Muscles, their innervation and functionMuscleCN innervationFunctionLPSIIIOpens the eyelidMuller's muscleIIIOpens eyelid when LPS tiredFrontalisVIICloses the eyelidOrbicularis oculiVIICloses the eyelid* CN III palsy leads to drooping of eyelid (Ptosis).* CN VII palsy may also cause ptosis.Also Know* All the extraocular muscles are supplied by CN III except lateral rectus and superior oblique.* Lateral rectus supplied by- CN VI* Superior oblique supplied by- CN IVRemember- LR6, S04; all other by CN III", 'role': 'assistant'}]