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 complement component is involved in both classical and alternative pathways - 
Select and explain. 
A. C1, B. C2, C. C3, D. C4
C: C3
Answer: C: C3 
Explanation: - the central process in the complement cascade is the activation of C3. - in classical pathway, activation of C3 is achieved by C4b2a ( classical C3 convease ). - the activation of C3 without prior paicipation of C4b2a is known as alternative pathway. Reference : Anathanarayan & paniker's 9th edition, pg no: 122,123 <\p>