Write the equality and conversion factors for:
The updated Daily Value (DV) for biotin is 30. mcg.
Identify the numbers as exact or measured, and if measured, give the number of significant figures.

• A. 1 day = 30. mcg;
  30. mcg biotin / 1 day and 1 day / 30. mcg biotin;
  30. mcg is measured and has 2 SF;
  1 day is measured and has 1 SF
• B. 1 day = 30. mcg;
  30. mcg biotin / 1 day and 1 day / 30. mcg biotin;
  30. mcg is measured and has 1 SF;
  1 day is measured and has no SF
• C. 1 day = 30. mcg;
  30. mcg biotin / 1 day and 1 day / 30. mcg biotin;
  30. mcg is measured and has 2 SF;
  1 day is exact
• D. 1 day = 30. mcg;
  30. mcg biotin / 1 day and 1 day / 30. mcg biotin;
  30. mcg is measured and has 1 SF;
  1 day is exact

Answer: (C)