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: Pathology
[{'content': "Tetrad of Urethritis, arthritis, conjunctivitis and oral ulcers seen in: \nSelect and explain. \nA. Reiter's syndrome., B. Heerfordt syndrome., C. Behcet syndrome., D. Cowden syndrome.", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]