**Core Concept**
The labia minora are a pair of thin folds of skin in the vulva, and their inner surface is lined by a specific type of epithelium that varies in different regions. Understanding the type of epithelium lining the labia minora is crucial for gynecological examinations and surgeries.

**Why the Correct Answer is Right**
The inner surface of the labia minora medial to the Hesselbach's (Ha) line is lined by stratified cuboidal epithelium. This type of epithelium is composed of multiple layers of cuboidal cells that provide a barrier against friction and abrasion. In the labia minora, stratified cuboidal epithelium is found in the area medial to the Hesselbach's line, which marks the boundary between the labia minora and the labia majora. This type of epithelium is well-suited for this area, as it can withstand the constant friction and movement of the labia minora.

**Why Each Wrong Option is Incorrect**
* **Option A:** Stratified squamous epithelium is found on the outer surface of the labia minora, not the inner surface medial to the Hesselbach's line.
* **Option B:** Pseudostratified columnar epithelium is found in the respiratory and urinary tracts, not on the inner surface of the labia minora.
* **Option D:** Transitional epithelium is found in the urinary bladder and ureters, not on the inner surface of the labia minora.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the type of epithelium lining the labia minora changes along its length, with stratified cuboidal epithelium found medial to the Hesselbach's line and stratified squamous epithelium found on the outer surface. This knowledge is crucial for gynecological examinations and surgeries.

**Correct Answer:** C. Stratified cuboidal epithelium.