This example shows a pet-selection dropdown built with React and D3, rendering a labeled menu with options for dog, cat, hamster, parrot, spider, and goldfish. The selected value updates React state via the `useState` hook, logged to the console, while a reusable `Dropdown` component maps over the option array to generate `<select>` elements. The code uses ReactDOM to mount the app and employs controlled component patterns with `onSelectedValueChange` callbacks, though no D3-specific APIs appear in the visible source.