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': 'A most common cause of anterior uveitis associated with arthritis – \nSelect and explain. \nA. Ankylosing spondylitis, B. Rheumatoid arthritis, C. Syphilis, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anterior uveitis is most commonly idiopathic or autoimmune and the most common cause is age-dependent:-\nChild → JRA is the most common cause\n\n\nYoung adult s → HLB-27 associated uveitis (Ankylosing spondylitis is the most common cause)\nOlder adults → Idiopathic anterior uveitis is most common.\nOverall most common cause → Idiopathic.', 'role': 'assistant'}]