Concept:Plasmodium species cause malaria. Each species has a specific fever pattern. Quartan malaria refers to fever recurring every 72 hours. Explanation:Quartan malaria is caused by Plasmodium malariae. Its fever pattern repeats every three to four days. This is a less severe form of malaria. The vector is the female Anopheles mosquito. Diagnosis is via blood tests. Treatment includes chloroquine. In contrast, Plasmodium falciparum causes the most severe and fatal malaria. Answer:B. Plasmodium malariae