Which of the following is phase-2 reaction –
**Core Concept**
Phase 2 reactions, also known as conjugation reactions, are a type of metabolic reaction that involve the attachment of a molecule to a drug or toxin to increase its water solubility and facilitate its excretion from the body. This process typically involves the action of enzymes such as glucuronyltransferase or sulfotransferase.
**Why the Correct Answer is Right**
The correct answer involves the conjugation of a molecule to a drug or toxin, which is a hallmark of phase 2 reactions. This process is mediated by enzymes such as glucuronyltransferase, which catalyzes the transfer of a glucuronic acid molecule to the drug or toxin, increasing its water solubility and facilitating its excretion. This type of reaction is essential for the elimination of many drugs and toxins from the body.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a phase 1 reaction, which involves the modification of a drug or toxin through oxidation, reduction, or hydrolysis.
**Option B:** This option is incorrect because it refers to a phase 0 reaction, which involves the initial absorption of a drug or toxin into the bloodstream.
**Option C:** This option is incorrect because it refers to a phase 3 reaction, which involves the final elimination of a drug or toxin from the body through processes such as excretion or metabolism.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that phase 2 reactions involve the conjugation of a molecule to a drug or toxin, increasing its water solubility and facilitating its excretion. This type of reaction is mediated by enzymes such as glucuronyltransferase and is crucial for the elimination of many drugs and toxins from the body.
**Correct Answer:** C.