This example demonstrates a simple interactive dropdown menu for selecting a pet, built with React’s `useState` hook and a `Dropdown` component. The selected value updates the menu’s displayed option, using an array of pet objects for data. The app is rendered with `ReactDOM.render` into the root element, styled with large and hidden overflow layout. It uses React 16.9 and does not rely on D3 for this particular fork, despite the smiley-face origin.