Okay, let's tackle this question about the length of the male urethra. First, I need to remember the anatomy of the male urethra. From what I recall, the male urethra is longer than the female's because it passes through the penis. The female urethra is about 4 cm, right? For males, I think it's around 20 cm. But wait, maybe there are different segments? The male urethra has three parts: the prostatic, membranous, and spongy (penile) parts. The total length would be the sum of these parts. Let me check my notes.

Oh right, the prostatic urethra is about 3-4 cm, the membranous part is 1-2 cm, and the spongy part is around 13-15 cm. Adding those up gives approximately 17-19 cm. But some sources might round it up to 20 cm. So the correct answer is 20 cm. Now, looking at the options, if the options are A. 10 cm, B. 15 cm, C. 20 cm, D. 25 cm, then the correct answer is C.

Now, the other options: 10 cm is too short, probably the female urethra. 15 cm might be if someone forgot to add the spongy part. 25 cm is way too long, maybe mixing with another structure. The key here is knowing the male urethra's segments and their lengths. Also, remember that the urethra's length is important clinically for procedures like catheterization or in urology exams. So the high-yield fact is that the male urethra is approximately 20 cm long, divided into three parts. The correct answer is C.

**Core Concept**
The male urethra is a fibromuscular tube that transports urine and semen. Its length is a clinically relevant anatomical landmark, divided into three segments: **prostatic**, **membranous**, and **spongy/penile**.

**Why the Correct Answer is Right**
The total length of the male urethra is **approximately 20 cm**. This includes:
- **Prostatic urethra** (3–4 cm) within the prostate gland,
- **Membranous urethra** (1–2 cm) passing through the urogenital diaphragm,
- **Spongy/penile urethra** (13–15 cm) extending through the corpus spongiosum of the penis.
These segments collectively account for the 20 cm length.

**Why Each Wrong Option is Incorrect**
**Option A: 10 cm** – Incorrect. This is closer to the **female urethra** (4 cm) but not applicable to males.
**Option B: 15 cm** – Incorrect. This underestimates the length, likely overlooking the spongy urethra’s contribution.
**Option D: 25 cm** – Incorrect. Exaggerated; no anatomical structure in the male urinary system reaches this length.

**Clinical Pearl / High-Yield Fact**
The male urethra’s length is critical for

✓ Correct Answer: C. 20 cm