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B
IgE
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C
IgA
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D
IgD
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Solution
The correct option is B IgA
Immunoglobulin A (IgA) is an antibody that plays a crucial role in the immune function of mucous membranes. IgA plays an important role in innate immunity which acts as an important first line of defence. The secretory component of sIgA protects the immunoglobulin from being degraded by proteolytic enzymes, thus sIgA can survive in the harsh gastrointestinal tract environment and provide protection against microbes that multiply in body secretions.