Ana de osorio is famous for discovering a cure for
the black death
malaria
smallpox
dysentery

Ana de Osorio is famous for discovering a cure for malaria.

Explanation: Ana de Osorio was the Countess of Chinchon in Spain. 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. 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.

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