This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Who among the following demonstrated that malaria is transmitted by Anopheles mosquito? 
Select and explain. 
A. Robe Koch, B. Louis Pasteur, C. Ronald Ross, D. Walter Reed
C: Ronald Ross
Answer: C: Ronald Ross 
Explanation: Sir Ronald Ross was a British doctor who received the Nobel Prize for his work on malaria. His discovery of the malarial parasite in the gut of Anopheles mosquito led to the discovery that malaria was transmitted by Anopheles, and laid the foundation for combating the disease. Ref: Park, 21st Edition, Page 6.