Answer: testes.
- A testes
- B ovaries
- C uterus
- D urinary bladder
Correct answer: A. testes
Explanation: Sperms are produced in the seminiferous tubules of the testes.

The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.