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': 'Killer cells & helper cells are part of - \nSelect and explain. \nA. B cells, B. T cells, C. Monocytes, D. Macrophage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Option b is partially correct :\nHelper cells are CD-4 T cells\nKiller cells are antibody dependent cytotoxic cells, which belong to large granular lymphocytes (not T cells).', 'role': 'assistant'}]