White blood cells act ___________ (A) as a defence against infection (B) as a source of energy (C) for clotting blood (D) as a medium for oxygen transport from lung to tissues

As a defense against infection

White blood cells (WBC’s) serve as a defense system against all pathogens in the human body. These antibodies identify and counter the foreign agents or pathogens such as bacteria, fungi and viruses, which invade and cause severe infections in the human body.

Hence, the correct option is (A)

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