Final answer:
The lymphoid tissues of the intestinal tract are known as mucosa-associated lymphoid tissue (MALT), which is important for initiating immune responses within the gastrointestinal tract Option A.
Step-by-step explanation:
The lymphoid tissues of the intestinal tract are collectively referred to as mucosa-associated lymphoid tissue (MALT). This includes several types of tissue structures, such as the tonsils, Peyer's patches, and other diffuse lymphoid tissues. MALT is a key component of the secondary lymphoid tissue, which also comprises the spleen and lymph nodes. MALT has a significant role in initiating immune responses against pathogens that are encountered in the mucous membranes of the gastrointestinal tract. Specifically, Peyer's patches are prominent MALT structures in the small intestine that contain specialized M cells to sample and transport material from the intestinal lumen to initiate an adaptive immune response.