Mammals can drink water and also derive it from

The correct option is glucose oxidation.

Mammals obtain water primarily through two sources: ingestion (drinking water and consuming moisture-rich food) and metabolic processes within their cells. The water produced during these metabolic processes is known as metabolic water.

During cellular respiration, glucose is oxidized in the presence of oxygen to produce carbon dioxide, water, and energy (ATP). This biological oxidation process can be chemically represented by the following equation:

$$C_6{H}_{12}{O}_6+6O_2\to 6C{O}_2+6H_{2}O+\text{Energy (ATP)}$$

In this reaction, the hydrogen atoms in the glucose molecule combine with the inhaled oxygen to form water molecules. This metabolic water is crucial for survival, especially in desert mammals (like the kangaroo rat) that have extremely limited access to drinking water and rely almost entirely on the water produced via glucose oxidation.