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': 'Example of type 4 hypersensitivity is: \nSelect and explain. \nA. Serum sickness, B. Granulomatous reaction, C. Schwazman reaction, D. Ahus reaction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Granulomatous reaction', 'role': 'assistant'}]