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A 36 year old male presents with a complaint of passing dark-reddish urine. He states that yesterday he played basketball for 4 hours, which was the first time he had exercised in 4 months. He awoke this morning with sore muscles and discolored urine. Physical examination is unremarkable. The urine is reddish-brown in color; dipstick test for blood is positive, the pH is 5.1, the specific gravity 1.03. Microscopic examination of the urine reveals no red blood cells. What is the most likely etiology for this presentation?

AHemolyzed blood in the urine
BIngestion of foods that contained red dye C. Myoglobinuria
CMyoglobinuria
DNephrolithiasis
Biochemistry
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