This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Delayed tuberculin test response is due to- \nSelect and explain. \nA. B lymphocytes, B. T lymphocytes, C. Monocytes, D. Histiocytes', 'role': 'user'}, {'content': "Answer: B \nExplanation: Tuberculin test is type IV hypersensitivity reaction. Delayed or cell mediated hypersensitivity is a cell mediated response. The antigen activates specifically sensitised CD4 & CD8 T lymphocytes leading to the secretion of lymphokines and phagocyte accumulation. Reference : Anathanarayan & paniker's 9th edition, pg no: 162 <\\p>", 'role': 'assistant'}]