Active immunity is the type of immunity in which antibodies are produced against a specific antigen. This type of immunity takes time in order to produce enough antibodies to fight the pathogen. This immune response is long lived and is more effective. It results in the immunological memory which remains for life time. It is used for prophylaxis to increases body resistance. Passive immunity is a type of immunity in which antibodies are obtained from outside the body. An example includes antibodies obtained from mother through the breast milk. This immune response is short lived and less effective. It does not have any immunological memory. It is used for treatment of acute infection.
Thus, the correct answer is 'Used for prophylaxis to increases body resistance.'