Write the equality and conversion factors for:
An oral antiseptic label reads 10 mg Povidone-iodine (USP) per 1 mL solution.
Identify the numbers as exact or measured, and if measured, give the number of significant figures.

• A. 1 mL of solution = 10 mg Povidone-iodine (USP);
  10 mg Povidone-iodine (USP) / 1 mL solution and 1 mL solution / 10 mg Povidone-iodine (USP);
  10 mg is measured and has 2 SF;
  1 mL is measured and has 1 SF
• B. 1 mL of solution = 10 mg Povidone-iodine (USP);
  10 mg Povidone-iodine (USP) / 1 mL solution and 1 mL solution / 10 mg Povidone-iodine (USP);
  10 mg is measured and has 1 SF;
  1 mL is measured and has 1 SF
• C. 1 mL of solution = 10 mg Povidone-iodine (USP);
  10 mg Povidone-iodine (USP) / 1 mL solution and 1 mL solution / 10 mg Povidone-iodine (USP);
  10 mg is measured and has 2 SF;
  1 mL is exact
• D. 1 mL of solution = 10 mg Povidone-iodine (USP);
  10 mg Povidone-iodine (USP) / 1 mL solution and 1 mL solution / 10 mg Povidone-iodine (USP);
  10 mg is measured and has 1 SF;
  1 mL is exact

Answer: (D)