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
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: 
Select and explain. 
A. Psoriasis vulgaris, B. Reiter's synd, C. Bechet's synd, D. Sarcoidosis
B: Reiter's synd
Answer: B: Reiter's synd 
Explanation: B i.e. Reiter's syndrome