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
Brown's syndrome involves 
Select and explain. 
A. Superior rectus, B. Superior oblique, C. Medial rectus, D. Lateral rectus
B: Superior oblique
Answer: B: Superior oblique 
Explanation: Brown's syndrome is due to fibrous tightening of the superior oblique tendon.