**Core Concept**
Von-Meyenburg's complexes, also known as bile duct hamartomas, are benign liver lesions composed of dilated bile ducts and associated with liver parenchyma. These lesions are typically found incidentally in the liver and are often considered a variant of normal liver morphology.

**Why the Correct Answer is Right**
Von-Meyenburg's complexes are characterized by the presence of ectatic bile ducts within a fibrotic stroma, which is thought to result from abnormal bile duct formation during embryonic development. These lesions are usually asymptomatic and are often discovered incidentally during imaging studies of the liver for unrelated reasons. The presence of Von-Meyenburg's complexes can sometimes be associated with an increased risk of developing liver adenomas and hepatocellular carcinoma.

**Why Each Wrong Option is Incorrect**
**Option A:** Brain - Von-Meyenburg's complexes are not typically associated with the brain, which has a different embryonic development and histological morphology compared to the liver.
**Option C:** Kidney - These lesions are not found in the kidney, which has a distinct embryonic development and histological structure that is unrelated to bile duct formation.
**Option D:** Spleen - Von-Meyenburg's complexes are not associated with the spleen, which is an organ involved in immune function and blood filtration, and has a different histological structure compared to the liver.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize Von-Meyenburg's complexes as benign liver lesions to avoid unnecessary diagnostic workup and to differentiate them from more serious liver conditions, such as liver adenomas or hepatocellular carcinoma.

**✓ Correct Answer: B. Liver**