Small amount of iodine is necessary in our diet because of which of the following reason?

Compensate for underactive thyroid gland

The correct answer is Option (2) - Compensate for underactive thyroid gland

A small amount of iodine required in our diet is crucial for proper functioning of the thyroid gland, which regulates metabolism, growth, and development. When iodine levels are insufficient, the thyroid becomes underactive, leading to hypothyroidism and its associated health problems.