A React example demonstrates a dropdown menu for selecting a pet, with the chosen value displayed as the selected option. The code imports React and ReactDOM, using the `useState` hook to manage the selected value and a reusable `Dropdown` component that renders a `<select>` element. The options array provides five pet choices, and the `onSelectedValueChange` callback updates the state via `setSelectedValue`. The interface renders in the browser with custom CSS styling for the label and select elements.