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How can hexagonal uric acid crystals can be distinguished from cystine crystals?
A.
Cystine is insoluble in hydrochloric acid but uric acid is soluble
B.
Cystine gives a positive nitroprusside test after reduction with sodium cyanide
C.
Cystine crystals are more highly pigmented
D.
Cystine crystals form at neutral or alkaline pH, uric acid at neutral to acidic pH