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: Medicine
A patient presents with foreign body sensation in eye and swollen knee joint after a leisure trip. The most probable diagnosis is: 
Select and explain. 
A. Sarcoidosis, B. Reiter's disease, C. Behcet's disease, D. SLE
B: Reiter's disease
Answer: B: Reiter's disease 
Explanation: Answer is B (Reiter's syndrome): Ahropathy following recent travel suggests a probable diagnosis of Reactive ahritis secondary to organisms endemic in the zone of travel. The association of conjunctivitis (foreign body sensation in the eye) with ahritis suggests diagnosis of Reiter's syndrome.