**Core Concept**
Transitional epithelium is a type of epithelial tissue found in certain parts of the body that requires flexibility and resilience to withstand mechanical stress and changes in organ size. It is characterized by its unique ability to stretch and recoil, allowing it to accommodate varying degrees of distension. Transitional epithelium is composed of multi-layered epithelial cells that can change shape in response to mechanical stress.

**Why the Correct Answer is Right**
The correct answer is related to the anatomical locations where transitional epithelium is found. Transitional epithelium is present in the urinary system, specifically in the urinary bladder, ureters, and parts of the urethra. This is because these structures are subject to varying degrees of distension, and the transitional epithelium allows them to stretch and recoil accordingly. The unique properties of transitional epithelium enable the urinary system to function properly and maintain homeostasis.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while stratified squamous epithelium is also found in the urinary system, it is not a characteristic feature of the urinary bladder and ureters.
**Option B:** Incorrect because pseudostratified columnar epithelium is found in the respiratory system, not the urinary system.
**Option C:** Incorrect because cuboidal epithelium is found in certain parts of the kidney, but it is not a characteristic feature of the urinary bladder and ureters.

**Clinical Pearl / High-Yield Fact**
Transitional epithelium is often associated with the development of certain types of cancer, such as transitional cell carcinoma, which can occur in the urinary bladder and ureters.

**Correct Answer: D. Urinary bladder.