**Core Concept:** Cholestasis is a condition characterized by the عرقلة (obstruction) of the hepatobiliary system, causing reduced clearance of toxic substances and increased risk of liver injury due to impaired conjugation and excretion of bile acids. Cholestatic drugs are medications that cause cholestasis as a side effect.

**Why the Correct Answer is Right:**

D-induced cholestasis is primarily due to the inhibition of the enzyme α-glucuronidase, which results in decreased conjugation of bilirubin and other substrates. This leads to increased unconjugated bilirubin levels and ultimately cholestasis. D-induced cholestasis is mainly seen with the use of D-penicillamine, an antirheumatic drug.

**Why Each Wrong Option is Incorrect:**

A and B are incorrect because they are not cholestatic drugs. A-induced cholestasis is primarily due to the inhibition of the enzyme 3α-hydroxysteroid dehydrogenase, which is involved in cortisol synthesis, while B-induced cholestasis occurs due to the inhibition of the enzyme 3α-hydroxysteroid dehydrogenase, which is involved in cortisol synthesis.

C is incorrect because it is an example of hepatotoxic drugs, not cholestatic drugs. Hepatotoxicity refers to liver damage, while cholestasis refers to obstruction of bile flow, and these are distinct entities.

**Clinical Pearl:**

Understanding the mechanisms of drug-induced cholestasis is crucial for identifying potential side effects and monitoring patients on these medications closely. Identifying cholestatic drugs can help physicians prevent and manage drug-induced liver injury.