I searched for the image and it points out to the liver. According to the choices, the answer is "converting toxins to less toxic forms" as the liver functions to detoxify substances through its cells (particularly in the smooth endoplasmic reticulum) via the cytochrome p450 system. Detoxification involves 2 phases, first is Phase I wherein the p450 system makes the toxic substance more hydrophilic (it means it is easily soluble to water) and can be readily excreted by the kidneys. If Phase I is insufficient, then the toxin enters Phase II which is conjugation with other molecules to make the toxin even more hydrophilic. The liver does not produce urine and excreting salt and urea as this is the function of the kidneys. The liver's main function is not digesting foods and liquids as that is the main function of the gastrointestinal tract, but the liver aids in the absorption of fats by the secretion of bile, thereby emulsifying the fats rendering it ready for absorption.
