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
Function of Kupffer cells in liver is 
Select and explain. 
A. Phagocytic, B. Lytic, C. Secretory, D. Excretory
A: Phagocytic
Answer: A: Phagocytic 
Explanation: 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