This example demonstrates a pet selector interface built with React and D3. It shows a dropdown menu populated with five pet options, defaulting to "Dog," and logs the selected value to the console. The implementation uses React's `useState` hook to manage the selected value and a custom `DropDown` component that renders an HTML `<select>` element. The component accepts `options`, `selectedValue`, and an `onSelectedValueChange` callback, triggering the state update on user interaction. The code relies on React 16.9 and ReactDOM for rendering.