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
Patch test is done to document 
Select and explain. 
A. Type I hypersensitivity, B. Delayed type hypersensitivity, C. Autoimmune disease, D. Immunocomplex deposition
B: Delayed type hypersensitivity
Answer: B: Delayed type hypersensitivity 
Explanation: Patch test is done to determine delayed (type 4) hypersensitivity for the suspected contact allergen. IADVL textbook of dermatology,page 789