Epididymitis is inflammation of which structure?

• A. Testes
• B. Vas deferens
• C. Epididymis
• D. Prostate

Answer: (C)

Epididymitis targets the epididymis, the coiled tube located at the back of each testicle where sperm mature and are stored. The term itself tells you exactly what’s inflamed: epididymis plus -itis means inflammation. This is different from inflammation of the testes (orchitis), the vas deferens (vasitis), or the prostate (prostatitis). So the structure involved—and thus the correct answer—is the epididymis.