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
[{'content': 'N.K cell and cytotoxic cells are differentiated by - \nSelect and explain. \nA. Interferons reduce N.K cell activity, B. Antibody specificity, C. Receptor fo IgG, D. Presence in spleen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: NK cells are unique, however, as they have the ability to recognize stressed cells in the absence of antibodies and MHC, allowing for a much faster immune reaction. They were named "natural killers" because of the initial notion that they do not require activation to kill cells that are missing "self" markers of MHC class 1.Cytotoxic Tells are antibody specific. Reff: Ananthanarayanan & Panikers textbook of microbiology 9th edition pg:137', 'role': 'assistant'}]