This example demonstrates a React component that lets users select a pet from a dropdown menu, with the current choice displayed alongside the label. Using the `useState` hook, the app manages the selected value and passes it to a reusable `Dropdown` component, which renders a `<select>` element with options defined in an array. The code integrates React 16.9 and ReactDOM 16.7 with D3 v7 loaded via CDN, though no D3 visualization is used here. The interaction is handled through the `onChange` event, updating state and re-rendering the selection.