The correct option is D Charles Laveran
The parasite which causes malaria, from the genus Plasmodium, was first observed in the blood of a patient who had died from the disease by Charles Louis Alphonse Laveran, a French physician working in Algeria. This was in 1880, a few years later, in 1897-1898, a British army doctor called as Ronald Ross showed that malaria could be transmitted via the bite of a mosquito. Both doctors eventually received the Nobel Prize for their discoveries.