This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
A patient with this condition , presents with retraction of eye lid on chewing. This represents 
Select and explain. 
A. Abducent palsy, B. Third nerve misdirection syndrome, C. Marcus gunn Jaw winking syndrome, D. Oculomotor palsy
C: Marcus gunn Jaw winking syndrome
Answer: C: Marcus gunn Jaw winking syndrome 
Explanation: Marcus gunn Jaw winking syndrome Marcus Gunn Jaw Winking Ptosis is a congenital ptosis Associated with synkinetic movements of upper lid on masticating movements of the jaw. It is usually unilateral but rarely presents bilaterally. Affects males and females in equal propoion . Etiology This synkinetic movement results from a congenital aberrant connection between motor branches of trigeminal nerve controlling muscles of mastication and superior division of oculomotor nerve controlling the levator palpebrae superioris Ref : ak khurana 7th ed