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
False about YδT-cells 
Select and explain. 
A. Constitute about 5% of total T-cells, B. Lack both CD4 and CD8 molecules, C. Usually found in gut mucosa, D. Part of acquired immunity
D: Part of acquired immunity
Answer: D: Part of acquired immunity 
Explanation: YδT-cells are part of innate immunity.