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
A patient with ptosis presents with retraction of the ptotic eye lid on chewing. This represents- 
Select and explain. 
A. Marcus Gunn Jaw winking syndrome, B. Third nerve misdirection syndrome, C. Abducent palsy, D. Occulomotor palsy
A: Marcus Gunn Jaw winking syndrome
Answer: A: Marcus Gunn Jaw winking syndrome 
Explanation: *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