This example demonstrates a simple pet-selection interface built with React. It shows a dropdown menu that lets users choose a pet from a list of six options, including dog, cat, hamster, and parrot. The code uses React's `useState` hook to manage the currently selected value and a custom `Dropdown` component that renders an HTML `<select>` element. The `onChange` event handler updates the state whenever the user makes a selection. ReactDOM renders the `App` component into the `#root` div, with the interface styled via embedded CSS.