MICROANATOMY

Detailed explanation-1: -Complement can play an important role in the induction of humoral immunity against viruses.

Detailed explanation-2: -Various functions of the complement system are immune clearance, activating inflammation, and opsonization. Therefore, the correct option is a . The complement system recognizes pathogen with the help of antibodies that activate the complement system via a classical pathway to clear the invading microorganisms.

Detailed explanation-3: -Complement proteins are present in the blood and body fluids as inactive precursors but are rapidly activated upon contact with bacterial cells. An activated complement cascade on the bacterial surface triggers a variety of responses that help to kill the bacterium.