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Pathology · Amyloidosis
Sample itemWhat stain demonstrates amyloid with apple-green birefringence?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Congo red
The defining Amyloidosis relationship supports Congo red; it is the option that most directly explains the biochemical pathway or pathological process in the stem.
Option by option
A. Congo red (correct)
Correct. Congo red is the appropriate conclusion from the key feature.
B. PAS stain
PAS stain does not account for the central finding in this item.
C. Prussian blue
Prussian blue is relevant in a different context but is not supported here.
D. Gram stain
Gram stain does not match the stated amyloidosis mechanism.
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.
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