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
False about Duane's retraction syndrome 
Select and explain. 
A. Fibrous tightening of lateral or medial rectus muscles, B. Narrowing of palpebral fissure on attempted abduction, C. Congenital ocular motility defect, D. All the above
B: Narrowing of palpebral fissure on attempted abduction
Answer: B: Narrowing of palpebral fissure on attempted abduction 
Explanation: Narrowing of palpebral fissure on attempted adduction.