This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Marcus gunn jaw winking phenomenon due to relation between which cranial nerves \nSelect and explain. \nA. VII + VIII, B. III + V, C. V + VII, D. III + VI', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., III + V Marcus Gunn phenomenon (a.k.a. Marcus Gunn Jaw-Winkingor 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.", 'role': 'assistant'}]