The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A previously healthy 29-year-old man comes to the emergency department because of burning with urination for several days. He has also had pain in the right ankle for 3 days and pain and swelling in the left knee for 1 day. Two weeks ago, he had several days of fever and bloody diarrhea, for which he was treated with antibiotics. Examination shows a small left knee effusion and bilateral conjunctival injection. Which of the following is the most likely additional finding in this patient?   (A) Circular erythematous rash with central clearing   (B) Pain on passive extension of the fingers   (C) Palpable mass in the right lower quadrant   (D) Tenderness at the insertion of the Achilles tendon
['(D) Tenderness at the insertion of the Achilles tendon <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Circular erythematous rash with central clearing \n (B) Pain on passive extension of the fingers \n (C) Palpable mass in the right lower quadrant \n (D) Tenderness at the insertion of the Achilles tendon <> possible answers', '  A previously healthy 29-year-old man comes to the emergency department because of burning with urination for several days. He has also had pain in the right ankle for 3 days and pain and swelling in the left knee for 1 day. Two weeks ago, he had several days of fever and bloody diarrhea, for which he was treated with antibiotics. Examination shows a small left knee effusion and bilateral conjunctival injection. Which of the following is the most likely additional finding in this patient? <> context@']