This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Function of Kupffer cells in liver is \nSelect and explain. \nA. Phagocytic, B. Lytic, C. Secretory, D. Excretory', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kupffer cells (KC) constitute 80-90% of the tissue macrophages present in the body. They reside within the lumen of the liver sinusoids and are therefore constantly exposed to gut-derived bacteria, microbial debris, and bacterial endotoxins, known to activate macrophages & has got phagocytic action. Ref: Medical Physiology, Indu Khurana', 'role': 'assistant'}]