This example shows an interactive dropdown menu for selecting a pet, with the chosen option displayed in a label. The interface is built with React’s `useState` hook to manage the selected value, while a custom `Dropdown` component renders the `<select>` element and its options. D3 is loaded but not directly used in the interaction logic, serving only as a dependency in the page setup. The code imports React and ReactDOM, maps over an array of pet options, and updates the selection state via the `onSelectedValueChange` callback.