Concept:The malaria parasite was first identified by Charles Louis Alphonse Laveran in 1889, for which he received the Nobel Prize in 1907.
Explanation:Laveran examined blood from infected patients and saw a single-celled protozoan, now called Plasmodium, attacking red blood cells.
He proved that malaria is caused by this parasite and not by bacteria or other agents.
Later, Ronald Ross confirmed the parasite's life cycle inside mosquitoes, but Laveran made the initial discovery.
Other options: Ronald Ross discovered transmission by mosquitoes; Louis Pasteur worked on vaccinations; James Watson co-discovered DNA structure.
Thus, the correct discoverer of the malaria parasite is Charles Louis Alphonse Laveran.
Answer:B. Charles Louis Alphonse Laveran