Which of the following is true for $T-$lymphocytes in mammals?

  • A
    They consist of three main types: $T-$cells,helper $T-$cells,and suppressor $T-$cells.
  • B
    They are produced in the lymphoid tissue.
  • C
    They clean up injured cells and cellular debris.
  • D
    They are produced in the thyroid gland.

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