Which of the following is correct regarding blood coagulation?
$I$. Vitamin-$K$ is necessary for the formation of prothrombin.
$II$. Conversion of fibrinogen to fibrin is done by thrombin.
$III$. Conversion of prothrombin to thrombin is done by the enzyme complex prothrombinase.
The option with the correct combination is:

  • A
    $I$ and $II$
  • B
    $II$ and $III$
  • C
    $I$,$II$ and $III$
  • D
    None of these

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