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The aggregation of lymph nodules located throughout the mucosal lining of the ileum region of the small intestine is called:

  1. Lymphocytes

  2. Peyer's patches

  3. Tonsils

  4. White pulp

The correct answer is: Peyer's patches

The aggregation of lymph nodules located throughout the mucosal lining of the ileum region of the small intestine is called Peyer's patches. This is the only option that specifically mentions structures found in the ileum region of the small intestine. Lymphocytes (A) refers to a type of white blood cell found throughout the body, but not necessarily in this specific location. Tonsils (C) are found in the pharynx, not the small intestine. White pulp (D) refers to the lymphatic tissue in the spleen, which is not located in the small intestine. Therefore, Peyer's patches (B) is the correct answer.