Functions of the complement system are: a. Lysis of cell (formation of MAC) b. Opsonization c. induce the production of mediators of inflammation d. All answers are correct

The correct answer is d. All answers are correct.<br /><br />The complement system is a part of the immune system that enhances the body's response to infections and inflammation. Here are the functions of the complement system:<br /><br />a. Lysis of cell (formation of MAC): The complement system can form a membrane attack complex (MAC) that creates pores in the cell membrane of pathogens, leading to their destruction.<br /><br />b. Opsonization: The complement system can coat pathogens with complement proteins, which act as opsonins. These opsonins enhance the ability of phagocytes to recognize and engulf the pathogens.<br /><br />c. Induce the production of mediators of inflammation: The complement system can activate other immune cells and release inflammatory mediators, such as cytokines and chemokines, which help to recruit immune cells to the site of infection or injury.<br /><br />Therefore, all the options provided are correct functions of the complement system.