_____ is essential for the synthesis of thyroxine.
A
Potassium
B
Sodium
C
Calcium
D
Iodine
Correct Option:
D
Explanation
Iodine is an essential component of the thyroid hormones thyroxine and triiodothyronine. Inadequate iodine intake can reduce thyroid-hormone production and may cause goitre. This is why iodised salt is used to prevent iodine-deficiency disorders.
