This example shows a pet-selection menu built with React, where choosing an option from a dropdown updates the displayed selection. The app initializes with "spider" as the selected value, and the `Dropdown` component receives options, an ID, a change handler, and the current value via props. The `onChange` event on the `<select>` element triggers `onSelectedValueChange` with the new value, updating state through React's `useState` hook. The code uses React 16.9 and ReactDOM to render the interface, with the dropdown styling controlled by CSS in the HTML file.