**Core Concept**
Non-hemolytic jaundice refers to a condition where jaundice occurs without the breakdown of red blood cells, often due to liver dysfunction or biliary obstruction. The underlying principle being tested involves the metabolism and excretion of **bilirubin** and its byproducts, such as **urobilinogen**.

**Why the Correct Answer is Right**
In non-hemolytic jaundice, particularly in cases of liver dysfunction or biliary obstruction, **urobilinogen** is not adequately converted to **urobilin** or is not properly excreted. As a result, **urobilinogen** can be found in the **urine**. This occurs because the liver's ability to process bilirubin and its metabolites is impaired, leading to the accumulation and subsequent excretion of **urobilinogen** in the urine.

**Why Each Wrong Option is Incorrect**
**Option A:** Urobilinogen is not characteristically elevated in the stool in cases of non-hemolytic jaundice due to liver issues; it's more about the urine.
**Option B:** While urobilinogen can be produced in the gut, its presence in non-hemolytic jaundice is more relevant when discussing urine.
**Option D:** This option is not relevant to the typical presentation of non-hemolytic jaundice and urobilinogen metabolism.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that in non-hemolytic jaundice, especially when due to liver disease, **urobilinogen** can appear in the urine due to the liver's reduced ability to convert it into urobilin. This is a critical distinction in diagnosing the cause of jaundice.

**Correct Answer:** Correct Answer: B. urine