This example demonstrates a React-based dropdown menu for selecting a pet from a list of six options. The chosen value is logged to the console and passed as a prop to a custom `Dropdown` component, which renders a native HTML `<select>` element. The component manages its state using React’s `useState` hook and updates the selection via an `onSelectedValueChange` callback. The code uses React 16.9 and ReactDOM, with the app mounted into a root div.