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Question
What are the primary lymphoid organs in the immune system?
Options
Bone marrow and thymus
Spleen and lymph nodes
Heart and lungs
Tonsils and MALT
MCQ
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Solution
Primary lymphoid organs are bone marrow and thymus. These are the sites where immature lymphocytes originate, develop, and differentiate into antigen-sensitive cells capable of recognizing foreign substances.
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