Based on the provided flowchart of innate immunity, match the boxes labeled A, B, C, and D in List I with their corresponding barrier types in List II. List I List II A Box A 1 Cellular barrier B Box B 2 Cytokine barrier C Box C 3 Physical barrier D Box D 4 Physiological barrier Choose the correct answer from the options given below:

Step-by-step solution

Based on the components of innate immunity: Box A represents the epithelium of the urogenital tract. The mucous coating of the epithelium lining the respiratory, gastrointestinal, and urogenital tracts helps in trapping microbes entering our body, acting as a physical barrier. Thus, A matches with 3. Box B represents tears from eyes. Tears, along with acid in the stomach and saliva in the mouth, prevent microbial growth and act as physiological barriers. Thus, B matches with 4. Box C represents Natural Killer (NK)