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
Duane Retraction Syndrome is most commonly characterised by 
Select and explain. 
A. Deficiency in action of 6th nerve characterized by difficult abduction, B. Weakness of superior oblique, C. Presence of corneal pigmentation, D. Presence of acute increase in intraocular pressure
A: Deficiency in action of 6th nerve characterized by difficult abduction
Answer: A: Deficiency in action of 6th nerve characterized by difficult abduction 
Explanation: Answer- A. Deficiency in action of 6th nerve characterized by difficult abductionDuane retraction syndrome represents the most frequent and most prominent congenital (CCDD). cranial dysinnervation d.isorderDuane retraction syndrome is a congenital strabismus that is usually caused by failure of normal development of the abducens nerve (the sixth cranial nerve). There is absence ofthe abducens nerve and fascicle with anomalous innervation of the lateral rectus muscle by the oculomotor nerve.