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
Which of the following cells are defective in chronic granulomatous disease? 
Select and explain. 
A. Neutrophils, B. Lymphocytes, C. Plasma cells, D. Killer T cells
A: Neutrophils
Answer: A: Neutrophils 
Explanation: 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.