This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveitis, Subject name: Ophthalmology
[{'content': 'All of the following cause panuveitis except ? \nSelect and explain. \nA. Ankylosing spondylitis, B. Toxoplasmosis, C. Sarcoidosis, D. Sympathetic ophthalmitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Panuveitis. It is inflammation of all pas of the uveal tract - i.e. iris, ciliary body and choroid, manifestations of which can be seen in both the anterior (anterior chamber + posterior chamber) and posterior (vitreous cavity) segment of the eye. Cause of Panuveitis Sarcodiosis Tuberculosis Syphils Onchocerciasis Leptospirosis Brucelliosis Sympthetic Opthalmia Bechets's diseas Multiple Sclerosis Cysticercosis Vogt-Koyanagi-Harada Syndrome Retinal itraneuclear foreign body Masquerade syndrome:retinoblastoma , leukemia Ankylosing spondylitis causes anterior uveitis.(Seronegative ahropathy)", 'role': 'assistant'}]