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The primary lymphoid organs where lymphocytes mature are bone marrow and the:

AThymus
BSpleen
CTonsils
DAppendix
Answer & Solution
Correct answer: A. Thymus
1. Spleen and lymph nodes are secondary organs. 2. The thymus lies near the heart. 3. It shrinks by puberty. _Source: syllabus Biology, Chapter 8, Human Health and Disease._
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