This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Most impoant bactericidal agent is 
Select and explain. 
A. Cationic basic protein, B. Lactoferrin, C. Lysozyme, D. Reactive oxygen species
D: Reactive oxygen species
Answer: D: Reactive oxygen species 
Explanation: H2O2 -MPO - halide system is the most efficient bacterial system of neutrophils It is most efficient in Phagocytosis ref Robb ins 9/e p79