Which of the following substances is converted to a more active form after its secretion?

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[Chapter 7, IX A; Figure 7.16]. Testosterone is converted to a more active form (dihydrotestosterone) in some target tissues. Triiodothyronine $\left(\mathrm{T}_{3}\right)$ is the active form of thyroid hormone; reverse triiodothyronine $\left(\mathrm{rT}_{3}\right)$ is an inactive alternative form of $\mathrm{T}_{3}$. Angiotensin I is converted to its active form, angiotensin II, by the action of angiotensinconverting enzyme (ACE). Aldosterone is unchanged after it is secreted by the zona glomerulosa of the adrenal cortex.

Which of the Following Substances Is Converted to a More (T3)\left(\mathrm{T}_{3}\right)(T3​)

Which of the Following Substances Is Converted to a More $\left(\mathrm{T}_{3}\right)$