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
N.K. Cell provides immunity against 
Select and explain. 
A. Virus, B. Bacteria, C. Fungus, D. Chlamydia
A: Virus
Answer: A: Virus 
Explanation: Ans. is 'a' i.e., Virus . NK cells are considered to be impoant in immune surveillance and natural defence against virus infected cells and malignant mutant cells.