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': 'All of the following statements about NK cells are true except - \nSelect and explain. \nA. They are derived from large granular cells, B. They comprise about 5% of human peripheral lymphoid cells, C. They are MHC restricted cytotoxic cells, D. They express IgG Fc receptors', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., They are MHC restricted cytotoxic cells", 'role': 'assistant'}]