Which trace element plays a crucial role in the regulation of thyroid hormone production and is essential for the conversion of thyroxine (T4) to triiodothyronine (T3)?

A Selenium ✓
B Chromium
C Molybdenum
D Iodine

Explanation

Selenium is a cofactor for the enzyme iodothyronine deiodinase, which converts T4 to T3, an active form of thyroid hormone.

Source

American Journal of Clinical Nutrition
Minerals, and Trace Elements Minerals and Trace Elements Selenium and Thyroid Function Medium MEDICAL Confidence: high