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': 'Which of the following cells are defective in chronic granulomatous disease? \nSelect and explain. \nA. Neutrophils, B. Lymphocytes, C. Plasma cells, D. Killer T cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chronic granulomatosis results from neutrophils with a defective NAPDH oxidase system. This affects their ability to kill microorganisms, since they are unable to produce superoxide radicals.', 'role': 'assistant'}]