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
A most common cause of anterior uveitis associated with arthritis – 
Select and explain. 
A. Ankylosing spondylitis, B. Rheumatoid arthritis, C. Syphilis, D. Tuberculosis
A: Ankylosing spondylitis
Answer: A: Ankylosing spondylitis 
Explanation: Anterior uveitis is most commonly idiopathic or autoimmune and the most common cause is age-dependent:-
Child → JRA is the most common cause


Young adult s → HLB-27 associated uveitis (Ankylosing spondylitis is the most common cause)
Older adults → Idiopathic anterior uveitis is most common.
Overall most common cause → Idiopathic.