Read the following Assertion and Reason and choose the correct option. Assertion: Passive immunization involves the injection of preformed antibodies into the body. Reason: Passive immunization is useful in situations requiring an immediate immune response, such as in cases of tetanus or snakebites.

Step-by-step solution

When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body. This type of immunity is called active immunity. Active immunity is slow and takes time to give its full effective response. Injecting the microbes deliberately during immunisation or infectious organisms gaining access into body during natural infection induce active immunity. When ready-made antibodies are directly given to protect the body against foreign agents, it