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
N.K Cell provides immunity againts - 
Select and explain. 
A. Virus, B. Bacteria, C. Fungus, D. Chlamydia
A: Virus
Answer: A: Virus 
Explanation: NK cells are considered as an innate immune defence against cells that have lost the expression of ClassI MHC like virus infected cells and malignant cells. Reff: Ananthanarayanan & Panikers textbook of microbiology 9th edition pg: 137