Answer:
The root word which describes the penis in medical terminology is B. phall/o
Step-by-step explanation:
Testis is the male reproductive organ. They are in the sac of skin called scrotum. It hangs outside the body in the front of the pelvic region near the upper thighs.
They are important as they produce and store sperm. It also produces a hormone called testosterone which is responsible for the sex urges, fertility and development of muscle mass. The medical terminology which describes the penis is "Phall/o".