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: Skin
[{'content': "A 27-year-old male had burning micturation & urethral discharge. After 4 weeks he developed joint pains involving both the knees & ankles, redness of the eyes & skin lesions. The most probable clinical diagnosis: \nSelect and explain. \nA. Psoriasis vulgaris, B. Reiter's synd, C. Bechet's synd, D. Sarcoidosis", 'role': 'user'}, {'content': "Answer: B \nExplanation: B i.e. Reiter's syndrome", 'role': 'assistant'}]