Which one of the following statements is false in respect of viability of mammalian sperm?

  • [AIPMT 2012]
  • A

    Sperm is viable for only up to $24$ hours.

  • B

    Survival of sperm depends on the pH of the medium and is more active in alkaline medium.

  • C

    Viability of sperm is determined by its motility.

  • D

    Sperms must be concentrated in a thick suspension.

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