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: Pathology
[{'content': 'Delayed type of hypersensitivity is seen in following except - \nSelect and explain. \nA. Ahus phenomenon, B. Contact dermatitis, C. Tuberculin test, D. Graft vs host reaction', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ahus Phenomenon", 'role': 'assistant'}]