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: Medicine
[{'content': 'Most common extra articular manifestation seen in Ankylosing spondylitis \nSelect and explain. \nA. Anterior uveitis, B. Keratitis, C. Amyloidosis, D. Upper lobe pulmonary fibrosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: M/C extra articular manifestation - Acute anterior uveitis.', 'role': 'assistant'}]