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
Opsonins are - 
Select and explain. 
A. C3a, B. C3b, C. C5a, D. C5-C9
B: C3b
Answer: B: C3b 
Explanation: - the process of phagocytosis is fuher enhanced when micro organisms 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 complement pathway. Reference : Harsh mohan text book of pathology, 7th edition, pg no:121 <\p>