**Core Concept**
Unconjugated bilirubin is a form of bilirubin that has not yet been processed by the liver. It is produced during the breakdown of heme-containing proteins, such as hemoglobin, and is transported to the liver via the bloodstream. In the liver, unconjugated bilirubin is conjugated with glucuronic acid, making it water-soluble and ready for excretion into the bile.

**Why the Correct Answer is Right**
The correct answer is related to the transport mechanism of unconjugated bilirubin. Unconjugated bilirubin is bound to albumin in the bloodstream, which helps to prevent it from precipitating out of solution and causing damage to the blood vessels. This binding also allows unconjugated bilirubin to be transported to the liver, where it can be conjugated and excreted into the bile.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not related to unconjugated bilirubin. Conjugated bilirubin is the form of bilirubin that has been processed by the liver and is water-soluble.

**Option B:** Incorrect because it is not a characteristic of unconjugated bilirubin. Unconjugated bilirubin is not water-soluble and cannot be excreted into the bile until it is conjugated.

**Option C:** Incorrect because it is not a direct effect of unconjugated bilirubin. While high levels of unconjugated bilirubin can cause jaundice, this is not a direct effect of the bilirubin itself, but rather a result of its accumulation in the tissues.

**Clinical Pearl / High-Yield Fact**
Unconjugated bilirubin is often referred to as "indirect" bilirubin, which can be a useful mnemonic to remember its characteristics.

**Correct Answer: B**