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: Pathology
[{'content': 'NK cell shows presence of ? \nSelect and explain. \nA. CD 44, B. CD 16, C. CD 54, D. CD 32', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., CD 16", 'role': 'assistant'}]