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
The process of 'phagocytosis' was discovered by 
Select and explain. 
A. Celsus, B. Elie Metchnikoff, C. Virchow, D. None of the above
B: Elie Metchnikoff
Answer: B: Elie Metchnikoff 
Explanation: None