A Runner Is in Training for the Chicago Marathon

A runner is in training for the Chicago Marathon. After his most recent 26 mile run, he notices that his urine was reddish-brown. The next morning, his urine is clear and yellow, but he decided to see his primary care physician. All of the hematology and chemistry results are within the reference range. What is the most likely reason for this scenario?

A) Initial dark color was caused by dehydration.
B) This is exercise-induced hemoglobinuria.
C) Uric acid crystals were precipitated in the initial urine.
D) There is insufficient information to determine the reason.

Correct Answer:

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