This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'NK cells express- \nSelect and explain. \nA. CD 15, CD 55, B. CD16, CD56, C. CD 16,CD 57, D. CD21 CD 66', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Harshmohan textbook of pathology 7th edition. NK cells carries surface molecules of CD2, CD16, CD56..', 'role': 'assistant'}]