Q: Which substance is typically not present in urine?  

Answer: D

Glucose is typically not found in urine under normal circumstances. The kidneys play an important role in regulating the amount of glucose in the body, and in healthy individuals, they will reabsorb nearly all of the glucose that is filtered through the glomerulus back into the bloodstream. This is because glucose is an important source of energy for the body, and its levels must be tightly regulated. In some cases, such as in individuals with uncontrolled diabetes, glucose may appear in the urine due to the kidneys being overwhelmed with excess glucose. However, in healthy individuals, the presence of glucose in the urine is abnormal and may indicate an underlying medical condition.

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