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
In TB, immunity is provided by: 
Select and explain. 
A. CD4+ cells, B. CD8+ cells, C. IgG, D. IgM
A: CD4+ cells
Answer: A: CD4+ cells 
Explanation: Activated CD4+ helper T cell is the speciﬁc immune mechanism eﬀective in TB.
It is a ‘cell-mediated' type of immunity (since it is intracellular).