Which hormone is converted into active form in liver-
**Core Concept**
The conversion of an inactive hormone into its active form in the liver is a crucial step in the regulation of various physiological processes. This process involves the action of specific enzymes that catalyze the conversion of the hormone from its precursor form to its active form.
**Why the Correct Answer is Right**
The hormone that is converted into its active form in the liver is **thyroxine (T4)**. T4 is converted to its active form, **triiodothyronine (T3)**, through a process known as deiodination, which is catalyzed by the enzyme **5'-deiodinase**. This enzyme is present in the liver and other tissues, where it converts T4 into T3, which then exerts its biological effects.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the conversion of T4 to T3 is a well-established process that occurs in the liver.
* **Option B:** This option is incorrect because the conversion of T4 to T3 is not a process that occurs in the kidneys.
* **Option C:** This option is incorrect because while the liver does play a role in the metabolism of various hormones, the conversion of T4 to T3 is a specific process that occurs through the action of 5'-deiodinase.
**Clinical Pearl / High-Yield Fact**
The liver plays a crucial role in the regulation of thyroid hormone levels by converting T4 to T3, which is the biologically active form of the hormone.
**Correct Answer:** C.