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 Question of the day

A postoperative patient on intravenous fluids develops lesions in the mouth (angular stomatitis). Urinalysis indicates an excretion of 15 μg riboflavin/mg creatinine, which is abnormally low. Which of the following TCA cycle enzymes is most likely to be affected?

A. Citrate synthase

B. Isocitrate dehydrogenase

C. Fumarase

D. Malate dehydrogenase

E. Succinate dehydrogenase

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