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': 'A patient with ptosis presents with retraction of the ptotic eye lid on chewing. This represents- \nSelect and explain. \nA. Marcus Gunn Jaw winking syndrome, B. Third nerve misdirection syndrome, C. Abducent palsy, D. Occulomotor palsy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Congenital synkinetic ptosis (Marcus Gunn jaw- winking ptosis ) is characterized by retracted of the ptotic lid with jaw movement, i.e. with stimulation of ipsilateral pterygoid muscle. Ref: Khurana 7th/e p.395', 'role': 'assistant'}]