This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which of the following is responsible for phagocytosis? 
Select and explain. 
A. C5a, B. C3a, C. C3b, D. TNF-a
C: C3b
Answer: C: C3b 
Explanation: The process of phagocytosis is fuher enhanced when microorganisms are coated with specific proteins, opsonins from the serum. Opsonins establish a bond between bacteria and bacteria and the membrane of the phagocytic cell. C3b is opsonin generated by activation of cothe complement pathway. Reference: Harsh Mohan textbook pathology, 7th edition, pg no:121 <\p>