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ADA NBDE National Board Dental Part I

Category - NBDE

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Which of the following is characterized by an absence of lymphoid follicles and germinal centers?

Peyer’s patches
pharyngeal tonsil
spleen
thymus

Explanation

Answer: D - Like bone marrow, the thymus is a primary lymphoid organ and not a site of reactions to foreign antigens. Lymphoid follicles are sites of B lymphocyte proliferation in response to antigen stimulation.

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ADA NBDE National Board Dental Part I

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ADA NBDE National Board Dental Part I

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