This example demonstrates a simple dropdown menu built with React, allowing users to select a car brand from a list of options. The selected value is managed through React's `useState` hook and displayed in the console. The interface uses a native HTML `<select>` element, with options rendered via the React `Dropdown` component. Although the page loads D3.js and other libraries, the core interaction relies solely on React’s state management and event handling, with no data visualization or SVG rendering involved.