How much iodine is required daily for normal human development?

Correct option is C

Sol. The recommended daily intake of iodine varies by age and physiological status. For adults, the recommended daily allowance (RDA) is 150 micrograms (mcg). Pregnant and breastfeeding women require higher amounts, with RDAs of 220 mcg and 290 mcg, respectively. ​
Explanation of each option:
· (a) 50-100 micrograms – This amount is below the recommended daily intake for adults, which is 150 mcg. ​
· (b) 50-100 milligrams – This amount is excessively high. 1 milligram (mg) equals 1,000 micrograms (mcg), so 50-100 mg equates to 50,000-100,000 mcg, far exceeding safe intake levels.​
· (c) 100-150 micrograms – Correct answer. This range aligns with the recommended daily intake for adults, which is 150 mcg.
· (d) 100-150 milligrams – This amount is excessively high, corresponding to 100,000-150,000 mcg, which is far beyond the tolerable upper intake level for iodine.​