The correct option is D Hesperidium
In most fleshy fruits, the carpels are fused together and are not distinct as in dehiscent dry fruits. An exception is the hesperidium. The lemon (Citrus lemon) is a hesperidium. Hesperidium is many-chambered and seeded fleshy fruits developed from the multidisciplinary, synchronous and superior ovary. The epicarp is leathery and glandular, mesomorphic thin and smooth, e.g., lemons and oranges.
Therefore, the correct answer is option D.