Correct Option: C

Malarial parasite, (Plasmodium vivax), Protist of class Sporozoa, digenetic parasite causes malarial fever in human. The malarial parasite was discovered by Laveran (1880). Sir Ronald Ross (1898) discovered that Malaria disease is spread by mosquitoes. Its life cycle completes in two organisms-Primary host, female Anopheles mosquito and man (Intermediate or Secondary host). It enters human blood-through sporozoites. Malarial fever begins with the release of merozoites in the liver cells, from RBC of human.