Answer:
The correct answer is - epithelial tissue.
Explanation:
Mucous secretions are are essential in the immune response as it inhibits the microbial infections such as the bacteria or trap the dust particles that are present in respiratory tract.
Respiratory tract have epithelial tissue that contains cilliated cells or occasionally goblet cells. These cells are secrete mucus that moistens the epithelial cell surface and traps or adhere to the particles or microbes.
Thus, the correct answer is - epithelial tissue.
