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': "Diagnosis of contact dermatitis is done by ? \nSelect and explain. \nA. PATCH test, B. Woods lamp, C. Skin biopsy, D. Darrier's sign", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., PATCH test Diagnosis of Contact dermatitis Diagnosis of contact dermatitis is made by patch test. Patch test is the only effective means of confirming contact dermatitis. In patch test reading is taken after 48-72 hours to see the signs of delayed hypersensitivity, i.e., induration.", 'role': 'assistant'}]