Which one of the following is essential for thyroid gland to make thyroxin?
- A. NaCl
- B. KCl
- C. Cholesterol
- D. Iodine ✓
Correct Answer: D. Iodine
Explanation
Iodine is an essential trace element required by the thyroid gland to synthesize the thyroid hormone thyroxine (T4).
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