<prompt> Which of the following best denotes classical complement pathway activation in immuno inflammatory condition:C2, C4 and C3 decreasedC2 and C4 normal, C3 is decreasedC3 normal and C2, C4 decreasedC2, C4, C3 all are elevated  <response>: Answer is A C2, C4 and C3 decreased: The final outcome of both the pathways is formation of membrane attack complex , which causes lysis of cells. 