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 have which CD marker ?- \nSelect and explain. \nA. CD 3, B. CD 56, C. CD 19, D. CD 13', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Harshmohan textbook of pathology 7th edition. *NK cells comprises about 10 to 60 % of circulating lymphocytes. These lymphocytes do not have B or T cell marker.NK cell carries surface molecule of CD2, CD16, CD56 but negative for T cell marker CD3', 'role': 'assistant'}]