The correct answer is option 1, Apple. The fleshy thalamus refers to the part of the fruit that surrounds the seed or core. In this case, an apple has a fleshy thalamus that is edible. It is important to note that not all fruits have a fleshy thalamus that is edible. Apples, however, are known for their crisp and juicy texture, which is a result of the edible fleshy thalamus. The other options, such as tomatoes, oranges, and mangoes, also have a fleshy thalamus, but it is not typically consumed as part of the fruit. It is important to consider the specific characteristics of each fruit when determining whether the fleshy thalamus is edible or not.