What is the normal count of $CD_4$ cells in a healthy human?

  • A
    $ > 900 \times 10^{3} / \text{lit.}$
  • B
    $ > 900 \times 10^{6} / \text{ml.}$
  • C
    $ > 900 \times 10^{6} / \text{lit.}$
  • D
    $ < 900 \times 10^{6} / \text{ml.}$

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