Answer: Ana de Osorio is famous for discovering a cure for <u>malaria</u>.
Explanation: Ana de Osorio was the Countess of Chinchon in Spain. <u>During a trip she made with her husband to Peru, both of them went down with malaria; however, she discovered a local cure, which consisted in a powdered bark of a Peruvian tree, that helped her and her husband to be healthy again</u>. When Ana de Osorio came back to Spain, she took her local cure with her, which allowed her to cure many Spaniards after a malaria outbreak hit her native country.
