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

  • A
    They clean up injured cells and cellular debris.
  • B
    They originate in the thyroid.
  • C
    They have three main types: cytotoxic $T$-cells,helper $T$-cells,and suppressor $T$-cells.
  • D
    They originate from lymphoid tissues.

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