Which statement about the excretion of ingested fluorides is true?

In the context of fluoride excretion, it is important to understand the physiological processes involved. When fluoride is ingested, it is absorbed into the bloodstream and circulated throughout the body, where it can have beneficial effects on dental health. However, a significant portion of the fluoride consumed is excreted through the kidneys.

This excretion occurs primarily in the urine, making it a key route by which fluoride is eliminated from the body. In healthy individuals, approximately 50-60% of ingested fluoride is excreted within 24 hours, depending on factors such as hydration status and kidney function.

Given this context, if one statement describes the renal excretion of fluoride accurately while the other does not, it clarifies why one statement is true, supporting the conclusion of option B. Understanding the balance between fluoride's benefit and excretion highlights the importance of managing fluoride intake and recognizing how the body processes it, underscoring the need for accurate information regarding fluoride's behavior in the human body.