Colostrum, the yellowish fluid, secreted by mother during the Inittlal days of lactation is very essentlal to impart immunity to the newbom infants because it contains

  • [NEET 2019]
  • A

    Natural killer cells

  • B

    Monocytes

  • C

    Macrophages

  • D

    Immunoglobulin $A$

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