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Orthopaedics · Arthritis
Sample itemWhat crystal is positively birefringent?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. CPPD
This item reviews Arthritis; CPPD is the best answer because it directly matches the orthopedic or dermatologic pattern described.
Option by option
A. Urate
Urate does not fit the stated presentation.
B. Bilirubin
Bilirubin is unsupported by the key finding.
C. CPPD (correct)
Correct. CPPD fits the defining feature.
D. Cystine
Cystine is plausible but is not the best answer.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.