The structures which is not associated with lymph nodes is Hassall's corpuscles and is denoted as option D in this particular context.
These contain lymphocytes and are a major component of the immune system which are responsible for protection of the body system. They are bean shaped and fight different types of pathogens which are causative organisms for diseases and infections.
The Hassall's corpuscles are produced in the human thymus and although they form part of the lymphatic system produce and initiate different responses. This is therefore the reason why the corpuscles are not closely related to lymphatic nodes.
The options include the following:
a. afferent lymphatic vessels
b. hilus
c. medullary sinus
d. Hassall's corpuscles
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