Which root means tube?

• A. Salpin
• B. Sang
• C. Sarco
• D. Rub

Answer: (A)

The concept tested is recognizing medical roots by meaning. The root that means tube comes from Greek salpinx, giving the combining form salping/o- or salpin- to indicate a tube, especially the fallopian (uterine) tube or other tubular structures. This is why the correct choice fits: it directly corresponds to tube in medical terms such as salpingitis (inflammation of a tube) or salpingectomy (removal of a tube). The other options map to different ideas—sang- relates to blood, sarco- to flesh, and rub- (or related forms) to red—so they don’t denote a tube.