After her last check-up, Harriet was informed that her active Vitamin D levels were low.  Which of the following conditions may explain why this is so?

A. Melanin production has increased due to sun exposure, reducing Vitamin D activation.
B. An increase in Vitamin D absorption at the intestines has overwhelmed the homeostasis of vitamin production at the kidneys.
C. Liver dysfunction has reduced the conversion of cholecalciferol to the intermediate for calcitriol production.


Answer: C

Anatomy & Physiology

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