Which of the following are secondary lymphoid organs?
$(a)$ Bone marrow
$(b)$ Tonsils
$(c)$ Spleen
$(d)$ Thymus
Choose the correct answer from the options given below:

  • A
    $(b)$ and $(c)$ only
  • B
    $(a)$ and $(b)$ only
  • C
    $(c)$ and $(d)$ only
  • D
    $(a)$ and $(d)$ only

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