If iodine supplementation in the diet was completely stopped today, thyroid hormone levels in blood will fall to zero after:: (A) 7 days, (B) 30 days, (C) 90 days, (D) 360 days
Answer is C. The thyroid gland has enough stores of iodine to sustain & to synthesize the thyroid hormone for 90 days even if there is no iodine supplementation.