Colostrum,the yellowish fluid secreted by the mother during the initial days of lactation,is very essential to impart immunity to the newborn infants because it contains:

  • A
    Natural killer cells
  • B
    Monocytes
  • C
    Macrophages
  • D
    Immunoglobulin $A$

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Active mammary glands are $....$ in structure.

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