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प्रश्न
The primary lymphoid organ is ______.
विकल्प
lymph nodes
spleen
bone marrow
tonsils
MCQ
रिक्त स्थान भरें
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उत्तर
The primary lymphoid organ is bone marrow.
Explanation:
Bone marrow is a primary lymphoid organ where blood cells form and B cells mature. Lymph nodes, spleen and tonsils are secondary lymphoid organs.
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