Answer to Question 1
ANS: A
Cotton underpants are preferable to nylon underpants. No evidence exists that limiting bathing, increasing fluids, decreasing salt intake, or cleansing the perineum with water decreases urinary tract infections in young girls.
Answer to Question 2
ANS: A
The transmission of ultrasonic waves through the renal parenchyma allows visualization of the renal parenchyma and renal pelvis without exposure to external beam radiation or radioactive isotopes. Computed tomography uses external radiation, and sometimes contrast media are used. Intravenous pyelography uses contrast medium and external radiation for x-ray films. Contrast medium is injected into the bladder through the urethral opening for voiding cystourethrography. External radiation for x-ray films is used before, during, and after voiding.