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
Pathergy test is used for ? 
Select and explain. 
A. Reither's syndrome, B. Bechet's syndrome, C. Lichen planus, D. Atopic dermatitis
B: Bechet's syndrome
Answer: B: Bechet's syndrome 
Explanation: Ans. is 'b' i.e., Bechet's syndrome Criteria for diagnosis of Bechet's disease Recurrent oral ulcer for at least 3 times in 12 months. Plus any two of the followings :? Recurrent genital ulcer. Eye inflammation with loss of vision. Characterstic skin lesion (erythema nodosum). Positive pathergy test (skin prick test).