Identify the correct statement$(s)$ regarding the human immune system.

  • A
    The thymus is a lobed organ located near the heart and beneath the breastbone.
  • B
    The spleen also acts as a large reservoir of erythrocytes.
  • C
    Lymph nodes serve to trap microorganisms or other antigens.
  • D
    $MALT$ constitutes about $50$% of the lymphoid tissue in the human body.

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