Practice question

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A 50-year-old woman presents with a 3-month history of dry eyes and a dry mouth. She feels like there is 'sand' in her eyes and needs to sip water constantly. She also reports fatigue and joint pains. Examination reveals bilateral parotid gland enlargement. Anti-Ro (SSA) and Anti-La (SSB) antibodies are positive. What is the most likely diagnosis?

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