This example demonstrates a pet-selection interface built with React, showing how dropdown menus manage state and re-render dynamically. It uses React hooks (`useState`) to track the selected value, initialized to "hamster," and passes it through a custom `Dropdown` component defined in `Dropdown.js`. The component maps over an array of pet options (goldfish, dog, cat, etc.) to generate `<option>` elements, triggering updates via the `onSelectedValueChange` callback. The page is styled with large typography and rendered into the DOM using `ReactDOM.render`.