This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dermatitis, Subject name: Dental
[{'content': 'Air-borne contact dermatitis can be diagnosed by- \nSelect and explain. \nA. Skin biopsy, B. Patch test, C. Prick test, D. Estimation of serum IgE levels', 'role': 'user'}, {'content': 'Answer: B \nExplanation: air borne contact dermatitis is diagnosed by patch testing with the specific allergen. eg: pahenium is the common allergen tested using patch test. IADVL TEXTBOOK OF DERMATOLOGY, INDIAN PATCH TEST SERIES PAGE 581.', 'role': 'assistant'}]