Match Column 1 with Column 2:

A-iii, B-iv, C-i, D-ii

The correct answer is Option (3) -A-iii, B-iv, C-i, D-ii

A.Physical Barriers: The skin serves as the primary physical barrier, effectively preventing the entry of microorganisms. Additionally, mucus coats the epithelium lining the respiratory, gastrointestinal, and urogenital tracts, aiding in the capture and entrapment of microbes attempting to enter our body.

B.Physiological Barriers: Various physiological factors act as barriers to microbial growth. These include the acidic environment in the stomach, saliva in the mouth, and tears produced by the eyes, all of which deter the proliferation of microbes.

C.Rheumatoid arthritis is an example of an autoimmune disease. It is a chronic inflammatory disorder that primarily affects the joints, causing pain, swelling, stiffness, and in some cases, joint deformity. In rheumatoid arthritis, the immune system mistakenly attacks the body's own tissues, particularly the the lining of the joints, leading to joint inflammation and damage.

D.Passive immunity involves the direct administration of pre-formed antibodies to provide immediate protection against foreign agents. An example of passive immunity is the yellowish fluid called colostrum, which is secreted by a mother during the initial days of lactation. Colostrum contains abundant antibodies, particularly IgA, which serve to protect the infant. Additionally, during pregnancy, the fetus receives a supply of antibodies from the mother through the placenta. These instances exemplify passive immunity.