This example demonstrates a React-based dropdown menu for selecting a pet, with the chosen value logged to the console and reflected in the selected option. It uses the `useState` hook to manage the selected value and a reusable `Dropdown` component that renders a `<select>` element. The code integrates React 17 and D3 v7 via CDN, with a custom `onSelectedValueChange` callback to update state. The interface includes a labeled dropdown with options for dog, cat, hamster, parrot, spider, and goldfish, styled with large text for readability.