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: Pathology
Phagocytosis was discovered by? 
Select and explain. 
A. Elie Metchinkoff, B. Aulus Cornelius Celsus., C. RudolfVirchow, D. Emil Adolf von Behring
A: Elie Metchinkoff
Answer: A: Elie Metchinkoff 
Explanation: “The discovery ofphagocytosis by Elie Metchinkoff marks the birth of immunology”.