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': 'Patch test is done to document: \nSelect and explain. \nA. Type I hypersensitivity, B. Delayed type hypersensitivity, C. Autoimmune disease, D. Immunocomplex deposition', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Delayed type hypersensitivity', 'role': 'assistant'}]