Which crop was introduced to Europeans during the Columbian Exchange?

"Christopher Columbus introduced horses, sugar plants, and disease to the New World, while facilitating the introduction of New World commodities like sugar, tobacco, chocolate, and potatoes to the Old World. The process by which commodities, people, and diseases crossed the Atlantic is known as the Columbian Exchange."

also"Introduced staple food crops, such as wheat, rice, rye, and barley, also prospered in the Americas. Some of these grains—rye, for example—grew well in climates too cold for corn, so the new crops helped to expand the spatial footprint of farming in both North and South America."

Explanation: