The correct option is C Toxin released by Plasmodium
Plasmodium is a malarial parasite that causes malaria fever. Plasmodium enters the human body as sporozoites and multiplies within the liver cells and later infects RBCs. The parasite feeds on the haemoglobin of RBCs. During the breakdown of haemoglobin, free haeme is released which is transformed into a toxic substance, haemozoin by the parasite. The RBCs rupture and release haemozoin into the blood plasma. Haemozoin is responsible for the chill and high fever recurring every three to four days.
Streptomyces produces antibiotic streptomycin which is used against several bacterial infections.
Haemophilus produces cytolethal distending toxin (HdCDT) which inhibits mammalian cell proliferation.