This example shows a pet-selection menu built with React, displaying a dropdown of six animal options and a label that updates based on the user’s choice. The code uses React’s `useState` hook to manage the selected value and a custom `Dropdown` component that renders a native `<select>` element with `onChange` event handling. It integrates React 16.9 with the `ReactDOM.render` API to mount the app into the DOM, while styling is handled through inline CSS in the `index.html` file.