This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cellular Pathology, Subject name: Pathology
[{'content': 'Phagolysosomal-enzymatic digestion occurs due to \nSelect and explain. \nA. Protease, B. MPO (Myeloperoxidase), C. Oxidase, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (MPO/Myeloperoxidase)The exogenous antigens, such as proteins synthesized by bacteria are ingested into the cell through cellular processes including endocytosis and phagocytosis. Then the antigens are hydrolyzed by hydrolytic enzymes like myeloperoxidase in the phagocytes, and the peptides are retained in an endolysosome or phagolysosome.', 'role': 'assistant'}]