Which term describes frequent urination at night?

• A. Polyuria
• B. Nocturia
• C. Oliguria
• D. Pyuria

Answer: (B)

Nocturia describes waking up during sleep to urinate. This term is about the timing of urination, not the total amount produced. Polyuria means producing unusually large amounts of urine over a 24-hour period, regardless of when you urinate. Oliguria refers to abnormally low urine output. Pyuria is the presence of pus or white blood cells in the urine, usually signaling infection or inflammation. So, when the question describes frequent urination at night, nocturia is the best fit because it specifically denotes nighttime urination.