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
Marcus Gunn jaw-winking phenomenon due to relation between which cranial nerves 
Select and explain. 
A. VII & VIII, B. III & V, C. V & VI, D. III & VI
B: III & V
Answer: B: III & V 
Explanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 505) *Marcus Gunn phenomenon (a.k.a Marcus Gunn jaw-Winking or Trigemino-oculomotor synkineses) *It is an autosomal-dominant condition with incomplete penetrance, in which nursing infants will have rhythmic upward jerking of their upper eyelid *This condition is characterized as a synkinesis: when two or more muscles that are independently innervated have either simultaneous or coordinated movements 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.