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: Pathology
[{'content': 'The cause of scleritis is - \nSelect and explain. \nA. Collagen vascular disease, B. TB, C. Trauma, D. Glaucoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Scleritis is commonly associated with connective tissue disease (including collegen vascular disease) such as → RA, SLE, PAN, Wegener's granulomatosis, Relapsing polychondritis.", 'role': 'assistant'}]