**Core Concept**
The development of genital swelling in males during embryogenesis is a complex process involving the formation of the genital tubercle, which eventually differentiates into male-specific structures under the influence of androgens. This process is crucial for the normal formation of the male external genitalia.

**Why the Correct Answer is Right**
The genital tubercle in males differentiates into the penis and the scrotum under the influence of dihydrotestosterone (DHT), a potent androgen produced from testosterone by the enzyme 5-alpha-reductase. The presence of androgens, particularly DHT, promotes the growth and differentiation of the genital tubercle into male-specific structures. The absence or deficiency of androgens can lead to abnormalities in genital development, such as hypospadias or undervirilization.

**Why Each Wrong Option is Incorrect**
- **Option A:** This is a distractor and not a recognized term in embryology.
- **Option B:** The glans penis does develop from the genital tubercle, but it is not the correct answer as the question asks for the overall differentiation of genital swelling.
- **Option D:** The testes develop from the genital ridges, but they are not the direct differentiation product of the genital tubercle.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize that abnormalities in genital development can be a sign of underlying androgen deficiency or insensitivity, which can have significant implications for the individual's health and fertility.

**Correct Answer:** C.