Which of the organisms most commonly causes reactive ahritis?: (A) Ureaplasma urealyticum, (B) Group A beta hemolytic streptococci, (C) Borrelia burggorferi, (D) Chlamydia
Answer is D. Answer is D (Chlamydia): Amongst the options provided Chlamydia is the most commonly implicated agent in Reactive ahritis. `Chlamydia Trachomatis is by far the most common cause of urethritis and of reactive ahritis following urethritis.