**Core Concept**
The total volume of cerebrospinal fluid (CSF) in the human body is a critical aspect of central nervous system (CNS) physiology. It is produced by the choroid plexus in the ventricles of the brain and circulates through the subarachnoid space before being reabsorbed into the bloodstream.

**Why the Correct Answer is Right**
The total volume of CSF is approximately 125-150 mL in adults, with a daily production rate of about 500 mL. This volume is maintained by a delicate balance between CSF production and reabsorption. The CSF circulates through the ventricles and subarachnoid space, where it helps to cushion the brain and spinal cord, remove waste products, and regulate intracranial pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** 250 mL - This is an overestimation of the total CSF volume, which is not sufficient to cover the entire CNS.
**Option B:** 500 mL - This is the daily production rate of CSF, not the total volume.
**Option C:** 50 mL - This is an underestimation of the total CSF volume, which is not sufficient to perform its vital functions.

**Clinical Pearl / High-Yield Fact**
The total volume of CSF is relatively small compared to the volume of blood in the body, yet it plays a crucial role in maintaining CNS homeostasis. Any significant alterations in CSF volume or composition can have profound effects on brain function and behavior.

**Correct Answer:** C. 125-150 mL.