This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Phagocytic function is assessed by - 
Select and explain. 
A. Proloiferative response to mitogen, B. Reduction of NBT (Nitroblue tetrazolium test), C. Serum immunoglobulin assay, D. Skin test with purified protein derivative
B: Reduction of NBT (Nitroblue tetrazolium test)
Answer: B: Reduction of NBT (Nitroblue tetrazolium test) 
Explanation: Lucocytes from the patients in chronic granulomatous disease fail to reduce nitroblue tetrazolium during phagocytosis. This nitroblue tetrazolium test access the phagocytic activity of leucocytes. Reference : Anathanarayan & paniker's 9th edition, pg no: 175 <\p>