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': 'Diagnostic meathod of choice in contact dermatitis \nSelect and explain. \nA. Clinical examination, B. Skin Biopsy, C. Tzank Smear, D. Patch Test', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Patch Test', 'role': 'assistant'}]