**Core Concept**
Isolated hyperbilirubinemia refers to an elevated level of bilirubin in the blood without an increase in other liver function tests, such as transaminases or alkaline phosphatase. This condition can be caused by various factors, including genetic disorders, medications, or other medical conditions.

**Why the Correct Answer is Right**
The correct answer is likely related to a medication that affects bilirubin metabolism. One such medication is Rifampicin, which induces the enzyme glucuronyl transferase, responsible for conjugating bilirubin. This induction leads to an increase in bilirubin excretion into the bile, resulting in isolated hyperbilirubinemia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly relate to isolated hyperbilirubinemia. The medication listed may cause other liver function test abnormalities.
**Option B:** This option is incorrect because it may cause a different type of liver enzyme abnormality, such as an increase in transaminases.
**Option C:** This option is incorrect because it may cause a decrease in liver function tests, not an increase.

**Clinical Pearl / High-Yield Fact**
Rifampicin-induced isolated hyperbilirubinemia is a well-documented side effect of this medication. It is essential to monitor liver function tests, especially bilirubin levels, when prescribing Rifampicin.

**Correct Answer: C. Rifampicin**