Botanical name of makoi is

The correct answer is Solanum nigrum.

To understand why, let us look at the botanical names and common names of the plants provided in the options:
1. Mangifera indica: This is the botanical name for the mango tree.
2. Solanum tuberosum: This is the botanical name for the potato plant.
3. Solanum nigrum: Commonly known as black nightshade or "Makoi" in India, it is a herbaceous plant belonging to the family Solanaceae.
4. Solanum melongena: This is the botanical name for the eggplant (brinjal).

Therefore, the botanical name of makoi is Solanum nigrum.