Which of the following statements is/are true?
$I.$ Urine is hypertonic while entering distal convoluted tubule.
$II.$ When the urine moves in the collecting tubule,it becomes hypertonic.
$III.$ Urine is isotonic in proximal convoluted tubule.
$IV.$ Urine becomes more and more hypotonic as it passes through the descending Henle's loop.

  • A
    $I$ and $IV$
  • B
    $I, II$ and $III$
  • C
    $II$ and $III$
  • D
    $I$ only

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