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: Microbiology
[{'content': 'Frei test which type of hypersensitivity ? \nSelect and explain. \nA. Type I, B. Type II, C. Type III, D. Type IV', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Type IV", 'role': 'assistant'}]