Malignant Pheochromocytoma most commonly metastasizes to

Correct Answer: C

Rationale: Malignant pheochromocytoma favors bone metastasis osteolytic spread (e.g., spine) is commonest. Liver and lungs occur less frequent. Lymph nodes spread but trail bone regional first. Bone's predominance distinguishes it, key to its metastatic pattern, unlike visceral or nodal sites.

Correct Answer: B

Rationale: Transition zone volume isn't a standard non-invasive ultrasound test for BOO requires MRI/TURP, invasive. Intravesical prostatic protrusion (IPP), bladder wall thickness (hypertrophy), and bladder weight (mass) assess obstruction non-invasively correlate with pressure/flow. TZ volume's invasiveness distinguishes it, key to practical diagnostics, unlike ultrasound-based metrics.

Correct Answer: C

Rationale: Juxtaglomerular (JG) cells secrete renin to regulate blood pressure, not the macula densa (senses NaCl), JG apparatus (collective structure), or cortical nephron (unit). This pinpoints renin's source, key for RAAS, contrasting with broader terms.

Correct Answer: D

Rationale: Glucose is fully reabsorbed in healthy kidneys, unlike magnesium, urea, and uric acid (excreted). This distinguishes normal urine composition, key for glycosuria detection, contrasting with waste products.

Correct Answer: A

Rationale: Creatinine is filtered and excreted without a threshold, unlike ascorbic acid, sodium, and citric acid (reabsorbed to limits). This identifies non-threshold excretion, key for GFR assessment, contrasting with regulated solutes.