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B
Chemical barrier
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C
Phagocytic barrier
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D
Inflammatory barrier
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Solution
The correct option is A Physiological barrier The immune system provides both the types of immune response innate and acquired immune responses. Innate immunity occurs naturally due to genetic factors or physiology. It provides physical barrier such as skin, physiological barriers such as pH of the stomach, bile juice, saliva, mucous membrane and tears and cellular barriers such as leukocytes, macrophage cell and cytokine barrier. Mucous membranes trap the microbes entering the body.