Condition in which a kidney is displayed downwards (“droops”) when a person stands up. 

• A. nephrolithiasis
• B. nephroptosis
• C. nephritis
• D. nephromegaly

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the root word 'nephr/o' which refers to the kidney in medical terminology.
2. Step 2: Analyze the suffixes of the given options to determine their meanings: '-lithiasis' means presence of stones, '-ptosis' means drooping or downward displacement, '-itis' means inflammation, and '-megaly' means enlargement.
3. Step 3: Identify the condition described: a kidney that 'droops' or moves downward when standing, which corresponds to the suffix '-ptosis'.
4. Step 4: Combine the root and suffix to form 'nephroptosis', meaning downward displacement or drooping of the kidney.
5. Step 5: Confirm that 'nephroptosis' is the correct term for the condition described, distinguishing it from other options like nephrolithiasis (kidney stones), nephritis (kidney inflammation), and nephromegaly (kidney enlargement).