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': 'Which of the following cell does not have cytotoxic activity ? \nSelect and explain. \nA. NK cells, B. Cytotoxic T-cells, C. Helper T-cells, D. Antibody dependent cells', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e.,Helper T-cells", 'role': 'assistant'}]