Smoking leads to ................. in the blood.

  • A
    Increase in $O_2$ and decrease in $CO_2$ bound to $Hb$
  • B
    Decrease in $O_2$ and increase in $O_2$ bound to $Hb$
  • C
    Increase in $CO$ and decrease in $O_2$ bound to $Hb$
  • D
    Decrease in $CO$ and decrease in $CO_2$ bound to $Hb$

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