Question

Which of the following is correct regarding cystine stones?

i. These are formed in response to bacterial infection.

ii. It is a genetic disorder.

iii. These grow quickly and become quite large.

iv. Occurs in people who consume high protein diet.

v. People who suffer excrete too much of certain amino acid.

• A. i and ii only
• B. ii, iii and iv only
• C. iii and v only
• D. ii and v only

Hint:

Cystine stones come from a genetic disorder in which too much of an amino acid is excreted.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
Cystine stones form in cystinuria, an inherited disorder of amino acid transport in the kidney.

Step 2: Check statements
i. Infection-related stones are struvite stones, not cystine. ii. Genetic disorder, correct.

Step 3: Continue
iii. Fast growth is a feature of struvite stones, no. iv. High protein diet relates to uric acid stones, no. v. Excess of an amino acid is excreted, correct.

Step 4: Compare the options
Only ii and v are correct.

Final Answer:
Statements ii and v are correct. \[ \boxed{\text{(D) }\text{ii and v only}} \]