This example demonstrates a basic React application with a pet-selection dropdown menu. It uses React 16.9.0 and ReactDOM to render a static form interface with no interactive behavior beyond native HTML select controls. The code imports React and ReactDOM, defines a functional App component containing a `<label>` and `<select>` element, and mounts it to the root DOM node. The page has a gray background with hidden overflow, though no data visualization or charting library is employed.