What is the term for a thin tube inserted into the body to drain fluids or inject fluids?

• A. Catheter
• B. Stent
• C. Probe
• D. Tube

Answer: (A)

The concept here is identifying the medical device used to drain fluids or deliver fluids into the body. The correct term is catheter. A catheter is a thin, flexible tube that is inserted into the body to drain fluids—like urine from the bladder—or to inject fluids such as medications or contrast. This specifically matches the described function, making it the best fit. The other terms don’t describe this function as precisely: a stent keeps a vessel open, a probe is mainly for exploring or examining, and a tube is a generic word that doesn’t pinpoint the particular device used for drainage or infusion. In practice, catheters require careful care to prevent infection and ensure proper placement and drainage.