The correct answer is option 2: Liver. The liver is responsible for the detoxification of the most poisonous substances in the body. It plays a crucial role in metabolizing and eliminating harmful toxins from the bloodstream. These toxins can include alcohol, drugs, environmental pollutants, and other harmful chemicals that enter the body.

The liver performs detoxification through a two-step process called biotransformation. In the first step, enzymes in the liver break down the toxic substances into intermediate compounds. In the second step, these intermediate compounds are further transformed into water-soluble compounds that can be easily eliminated through urine or bile. This process helps to protect the body from the harmful effects of toxins and maintain overall health.

Alert - Correct answer should be option 2: Liver.