(a) A group treated with 1000 ppm chitosan–silver nanoparticles showing congestion of central vein (white arrow) and focal area of mononuclear inflammatory cells infiltration (black arrow). (b) A group treated with 1000 ppm chitosan–silver nanoparticles, note small foci of mononuclear inflammatory cells infiltration (arrow). (c) A group treated with 1000 ppm chitosan–silver nanoparticles, note a congestion of portal blood vessel (black arrow) and hyperplasia of bile duct with few mononuclear inflammatory cells infiltration (white arrow). (d) A group treated with 500 ppm lavender nanoparticles showing mild congestion of central vein (arrow). (e) A group treated with 1000 ppm lavender nanoparticles showing congestion of central vein (arrow). (f) A group treated with 1000 ppm lavender nanoparticle, note small focal area of mononuclear infiltration (arrow). (g) A group treated with 1000 ppm lavender nanoparticles showing ductal hyperplasia (arrow) (H & E ×400).