Concept:The liver is a vital organ whose primary role is to process substances that enter the body, making detoxification and nutrient and drug metabolism its main function.
Explanation:The liver carries out many tasks, but its most important job is detoxification.
It breaks down harmful toxins, alcohol, and drugs into less dangerous substances.
These converted substances are then safely removed from the body through urine or bile.
The liver also metabolises carbohydrates, proteins, and fats for energy and storage.
It stores glucose as glycogen and produces bile to help digest fats.
Option A is incorrect because the hypothalamus regulates body temperature.
Option B is incorrect because the heart and kidneys primarily regulate blood pressure.
Option C is incorrect because endocrine glands are responsible for hormone production.
Therefore, the liver's primary function is the detoxification and metabolism of nutrients and drugs.
Answer:D. Detoxification and metabolism of nutrients and drugs