**Core Concept**
Gonorrhea is a sexually transmitted infection caused by Neisseria gonorrhoeae, a Gram-negative bacterium. The selective media used for its isolation is based on the principle of exploiting the nutritional requirements and metabolic activities of this bacterium.

**Why the Correct Answer is Right**
The selective medium for Neisseria gonorrhoeae is Thayer-Martin agar, which contains antibiotics like vancomycin, colistin, nystatin, and trimethoprim. These antibiotics inhibit the growth of other bacteria present in the sample, allowing Neisseria gonorrhoeae to grow selectively. The medium also contains supplements like hemin and nicotinamide adenine dinucleotide (NAD) to support the growth of this fastidious bacterium.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a selective medium for Neisseria gonorrhoeae.
**Option B:** This option is incorrect because it is not a specific selective medium for Neisseria gonorrhoeae.
**Option D:** This option is incorrect because it does not contain the necessary supplements and antibiotics to support the selective growth of Neisseria gonorrhoeae.

**Clinical Pearl / High-Yield Fact**
Thayer-Martin agar is a selective medium that allows the isolation of Neisseria gonorrhoeae from clinical specimens, which is essential for the diagnosis of gonorrhea.

**Correct Answer: C. Thayer-Martin agar**