Answer:
The correct answer is option C. thymus.
Explanation:
Lymph nodules are small groups of lymphoid tissue present in the loose under the wet epithelial membranes such as the digestive system, urinary bladder, and respiratory system.
The thymus does not contain lymph nodules like other lymphatic organs such as spleen, tonsils and lymph node. However, small lymphocytes known as thymocytes are grouped together in the cortex and epithelial reticular cells can appear like nodules in the medulla.
Thus, the correct answer is option C. thymus.