When we eat something that we like, our mouth waters. This is not actually water, but fluid that is secreted from the salivary glands.
Option 1: Nasal glands. Nasal glands are responsible for producing mucus, which helps to moisturize and protect the nasal passages. They are not involved in the production of the fluid in our mouth when we eat.
Option 2: Oval epithelium. Oval epithelium refers to a type of tissue found in the ovaries. It does not have a role in the production of fluid in the mouth.
Option 3: Salivary glands. The salivary glands, including the parotid, submandibular, and sublingual glands, are responsible for producing saliva. Saliva is the fluid that is secreted into our mouth, which helps to moisten and break down food.
Option 4: Tongue. The tongue is an important organ for tasting food and moving it around the mouth, but it does not produce fluid. The fluid is produced by the salivary glands.
Therefore, the correct answer is option 3 - salivary glands.