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': 'In TB, immunity is provided by - \nSelect and explain. \nA. CD 4+, B. CD 8+, C. IgG, D. IgM', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CD4+ . Cell mediated immunity confers protection against M. tuberculosis, while humoral immunity has no defined role in protection. . Two types of cells are essential. 1. Macrophages --> Directly phagocytize tubercle bacilli. 2. T cells (mainly CD4+) --> Induce protection through the production of IFN-y", 'role': 'assistant'}]