This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cells and Tissues of Immune System, Subject name: Pathology
[{'content': 'NK cell CD marker is - \nSelect and explain. \nA. 16, B. 60, C. 32, D. 25', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 16 o Two cell surface molecules, CD 16 and CD56, are widely used to identify* NK cells.", 'role': 'assistant'}]