<prompt> A patient presents with foreign body sensation in eye and swollen knee joint after a leisure trip. Which of the following is the most probable diagnosis?SLESarcoidosisReiters diseaseBehcets disease  <response>: As the patient in the question has developed ahritis following a recent travel, it could be a reactive ahritis secondary to organisms endemic in the zone of travel. Along with this, patient is showing features of conjunctivitis indicating a diagnosis of Reiters syndrome. Reactive ahritis Reiters syndrome consists of conjunctivitis, urethritis or cervicitis in female patients, ahritis, and characteristic mucocutaneous lesions. Ref: Harrisons Internal Medicine, 18th Edition, Chapter 176 