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
[{'content': 'NK cells are components of \nSelect and explain. \nA. Innate immunity, B. Acquired immunity, C. Adaptive immunity, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NK cells –\xa0Innate immunity.\nB cells and T cells – Acquired immunity.', 'role': 'assistant'}]