The answer is D. Carrot.
Tomato, cucumber, brinjal, and gourd are all fruits. Carrot is a vegetable.
A fruit is a seed-bearing structure that develops from the ovary of a flowering plant, whereas a vegetable is an edible plant or part of a plant other than a sweet fruit or seed.
Tomatoes, cucumbers, brinjals, and gourds are all fruits because they develop from the ovary of a flowering plant and contain seeds. Carrots, on the other hand, are vegetables because they are an edible plant or part of a plant other than a sweet fruit or seed.