In the Columbian exchange what did Columbus take to Europe back from the Americas?

In the Columbian Exchange, Columbus brought several new crops and goods from the Americas to Europe, including maize (corn), potatoes, tomatoes, and tobacco. These items significantly impacted European agriculture, diets, and economies. Additionally, he introduced syphilis, a disease that spread in Europe after his return. Overall, Columbus's voyages initiated a profound exchange of flora, fauna, and even diseases between the New and Old Worlds.