Which one of the following crystals is NOT found in normal urine?

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Calcium oxalates can be found in normal urine in varying pH levels. Ammonium biurate and triple phosphate can be found in normal alkaline urine. Leucine crystals are always abnormal, and can be found in maple syrup urine disease.

Which one of the following crystals is NOT found in normal urine?
A . Triple phosphate
B. Ammonium biurate
C. Calcium oxalate
D. Leucine

Answer: D