How much iodine is required daily for normal human growth?

Correct option is C

The recommended daily iodine intake for normal human growth is 100-150 micrograms (µg). Iodine is essential for thyroid hormone production, which regulates metabolism and brain development. Deficiency can lead to goiter and hypothyroidism.
Explanation of Each Option:
· 50-100 micrograms: Incorrect; lower than the recommended intake.
· 50-100 milligrams: Incorrect; an extremely high dose that could be toxic.
· 100-150 micrograms: Correct answer; the optimal daily iodine intake for adults.
· 100-150 milligrams: Incorrect; much higher than the safe limit.