Answer:- Option D the answer
Thyroid Stimulation Harmone
The Hypothalamus and Pitutory gland located in brain helps the thyroid gland .
The Hypothalamus released TRH which stimulation of Pitutory gland to release TSH .
TSH forms T4 and then T3 regulation in blood
The active form of Thyroid harmone is T3 and it's blood and tissue level are results of the secretions of T3 and it's precursor T4 .
So frist formation of T4 then T3 that' s why T3 not helps to form T4 actually.
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