The incorrect statement among the following is $:-$

• A
  Vitamin-$B$ (except vitamin $B_{12}$) and $C$ are not stored in the body,thus a regular supply is needed in the diet.
• B
  Vitamin pills can be taken without a doctor's advice because their excess is not harmful.
• C
  Deficiency of a vitamin is associated with a specific disease.
• D
  The vitamin used to cure night blindness can be obtained from carrots.